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C1 noun #46 よく出る 16分で読める

lux

上位46

練習する例文メモとヒント lux 30秒で

解説 lux in your Level:

At the A1 level, you don't need to worry about the math of lux. Just think of 'lux' as a special word for 'how much light is in a place.' Imagine you are in a room. If there is a lot of light, the 'lux' is high. If it is dark, the 'lux' is low. You might see this word on a light bulb box or a phone app. It is like a ruler for light. Just like we use 'meters' for how long something is, we use 'lux' for how bright a surface is. For example, 'The sun has many lux' or 'The lamp gives some lux to the table.' It is a technical word, but it just means 'light intensity.'

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At the A2 level, you can start using 'lux' to describe different environments. You might learn that a bright office has about 500 lux, while a dark street has only 10 lux. It is a noun that helps you be more specific than just saying 'bright' or 'dark.' You can use it with numbers. For example, 'This room needs 300 lux.' You might also see it in instructions for cameras or smart home devices. It is important to remember that lux is about the light that *hits* a table or a floor, not the light inside the bulb itself. If you move the lamp closer to your book, the lux on the book goes up.

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At the B1 level, you should understand that lux is a standard unit of measurement (SI unit). It is used to measure 'illuminance.' You can use it in sentences about health, work, or hobbies like photography. For instance, 'To stay healthy, you should get at least 1000 lux of light in the morning.' You should also be able to distinguish it from 'lumen,' which is the total light a bulb makes. Lux is lumens per square meter. If you are writing a report about a classroom, you might mention that the lighting is 400 lux, which is good for reading. It is a useful word for describing technical requirements in a simple way.

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At the B2 level, you should be comfortable using 'lux' in professional or academic contexts. You should understand the 'inverse square law'—that light gets much weaker as you move away. You can use lux to discuss topics like architecture, safety regulations, and environmental impact. For example, 'The architect maximized natural light to achieve a target of 500 lux on every desk.' You should also know that lux is weighted for human vision, meaning it measures how bright things look to *us*, not necessarily how much energy the light has. This is important when discussing different types of light, like LED versus sunlight.

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At the C1 level, you use 'lux' with precision in specialized fields. You understand that it is the SI unit for illuminance and luminous emittance. You can discuss the nuances of lighting design, such as the difference between lux (illuminance) and nits (luminance). You might use it in a sentence like, 'The high lux levels in the atrium, while aesthetically pleasing, created significant glare issues on the computer monitors.' You are aware of international standards (like ISO or CEN) that dictate lux requirements for various tasks. You can also discuss the biological effects of lux on the human endocrine system, specifically regarding melatonin suppression and the circadian rhythm.

At the C2 level, you have a mastery of 'lux' that allows you to use it in complex scientific, philosophical, or highly technical discussions. You understand the mathematical derivation of the lux from the candela and the steradian. You can critique lighting installations not just on their average lux, but on their 'uniformity ratio' and 'color rendering index' in relation to lux levels. You might discuss the 'luminous efficacy' of different light sources in terms of lux per watt. Your usage is flawless, whether you are writing a technical white paper on urban light pollution or a nuanced essay on the role of light in 19th-century painting compared to modern digital recreations.

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練習する例文メモとヒント

lux 30秒で

Lux is the standard SI unit for measuring illuminance, which is the amount of light falling on a specific surface area.
One lux equals one lumen per square meter, distinguishing it from lumens, which measure total light output from a source.
It is a critical metric in architecture, photography, workplace safety, and health, particularly for regulating human circadian rhythms.
Lux levels vary drastically from natural environments (100,000 lux in sunlight) to indoor settings (500 lux in offices) and moonlight (0.1 lux).

The term lux is a fundamental unit in the International System of Units (SI) that quantifies illuminance. To understand lux, one must first distinguish it from luminous flux, which is measured in lumens. While lumens represent the total amount of visible light emitted by a source, lux measures how much of that light actually lands on a specific surface area. Specifically, one lux is equal to one lumen per square metre. This distinction is critical in fields ranging from architecture and interior design to photography and workplace safety. When a lighting designer specifies the requirements for a new office building, they do not simply look at the bulbs; they calculate the lux levels on the desks to ensure employees can work without eye strain. In common parlance, people use lux to describe the intensity of light in a given environment. For instance, a bright sunny day might provide around 100,000 lux, whereas a typical office might have around 500 lux, and a moonlit night might offer only 0.1 lux. The word is indispensable for professionals who need to quantify the human perception of brightness, as the lux scale is weighted to match the spectral sensitivity of the human eye.

Technical Definition: The SI unit of illuminance, equal to one lumen per square metre (lm/m²).

The technician used a light meter to confirm that the operating theater reached the required 10,000 lux for surgical procedures.

In the context of health and biology, lux is frequently discussed concerning the circadian rhythm. Exposure to high lux levels in the morning, typically from natural sunlight or specialized light therapy lamps (often rated at 10,000 lux), helps regulate the sleep-wake cycle by suppressing melatonin production. Conversely, excessive lux levels from blue-light-emitting screens in the evening can disrupt sleep. Therefore, understanding lux is not just about engineering; it is about human well-being. Architects use lux calculations to maximize natural daylighting in sustainable buildings, reducing the need for artificial lighting and improving the mood of the occupants. In the film industry, cinematographers rely on lux meters to ensure consistent exposure across different takes, especially when blending natural and artificial light sources. The term also appears in legal standards; for example, emergency exit paths must maintain a minimum lux level to ensure safe evacuation during power outages.

Measurement Context: Used to determine if a space is sufficiently lit for specific tasks like reading, surgery, or driving.

To treat Seasonal Affective Disorder, patients are often advised to sit in front of a 10,000 lux light box for thirty minutes each morning.

Furthermore, the term lux is often found in the specifications of security cameras. A camera's 'lux rating' indicates the minimum amount of light required for the device to produce a usable image. A camera with a 0.001 lux rating is capable of seeing in near-total darkness, which is essential for high-end surveillance. In the automotive industry, the lux levels of headlights are strictly regulated to ensure they provide enough visibility for the driver without blinding oncoming traffic. The versatility of the word reflects its importance in bridging the gap between the physics of light and the practical experience of seeing. Whether you are an artist trying to capture the perfect glow on a canvas or an engineer designing a stadium's floodlights, lux provides the objective metric needed to master the environment. It is a word that turns the subjective feeling of 'brightness' into a precise, measurable reality.

Environmental Impact: High lux levels in urban areas contribute to light pollution, affecting nocturnal wildlife and astronomical observations.

The greenhouse was equipped with automated sensors to maintain a constant 20,000 lux for the tropical plants.

Even at 500 lux, the museum's lighting was carefully filtered to prevent UV damage to the ancient tapestries.

The streetlights were dimmed to 10 lux after midnight to conserve energy while maintaining public safety.

Using the word lux correctly requires an understanding of its role as a unit of measurement. It is almost always used as a noun, often preceded by a numerical value. In technical writing, it is common to see it used to define requirements or results of an experiment. For example, 'The experiment was conducted under a controlled illuminance of 300 lux.' Notice how it functions similarly to 'meters' or 'grams,' but it describes the intensity of light hitting a surface. In professional settings, you might hear it used in the context of compliance: 'The warehouse lighting must meet a minimum of 150 lux to comply with safety regulations.' Here, lux serves as the standard for legal and safety benchmarks. It is also used in comparative structures to illustrate the difference in brightness between environments. One might say, 'The transition from the 100,000 lux of the midday sun to the 50 lux of the dimly lit hallway caused temporary vision impairment.'

Comparative Usage: Used to contrast light levels, such as comparing indoor lighting to natural sunlight.

The sensor recorded a drop to 5 lux during the solar eclipse.

In creative writing or journalism, lux can be used to add a layer of technical precision to descriptions of atmosphere. Instead of saying a room was 'very bright,' an author might write, 'The sterile laboratory was bathed in a harsh 1,000 lux glow that left no corner in shadow.' This usage provides a specific sensory detail that appeals to readers familiar with lighting terminology. In the world of technology reviews, particularly for smartphones and cameras, lux is used to describe low-light performance. A reviewer might state, 'The camera's night mode performs exceptionally well even at 0.5 lux.' This tells the reader exactly how dark the environment can be while still allowing the device to function. When discussing plant growth, gardeners might say, 'These succulents require at least 10,000 lux of indirect light to thrive.' This usage shifts the focus from human vision to the biological needs of other organisms.

Biological Requirements: Specifying the light intensity needed for photosynthesis or circadian regulation.

The smart home system automatically adjusts the blinds to maintain a consistent 400 lux in the home office.

Another common way to use lux is in the context of 'lux levels.' This phrase is often used as a collective noun for the lighting conditions of a space. For example, 'We need to audit the lux levels across the entire campus.' This implies a comprehensive measurement of light intensity in various locations. In architectural blueprints, you might see annotations like 'Target: 300 lux at floor level.' This indicates the design goal for the lighting installation. It is also important to note that lux is an SI unit, so it is used globally, unlike the 'foot-candle' which is still used in the United States. When working on international projects, engineers must be careful to convert between these units. A sentence like 'The European standard requires 500 lux, which is approximately 46 foot-candles' demonstrates a high level of professional competence and clarity.

Global Standards: Using lux as the universal metric for international engineering and architectural collaboration.

The stadium's new LED system provides a uniform 2,000 lux across the pitch, perfect for high-definition broadcasting.

At only 0.25 lux, the full moon provides just enough light for basic navigation in the wilderness.

The software simulates how many lux will reach the basement through the light well.

While lux might not be a word you use every day at the dinner table, it is ubiquitous in several professional and specialized environments. If you walk into an architectural firm, you will hear designers discussing lux levels in relation to 'daylight harvesting' and 'glare control.' They use sophisticated software to model how natural light enters a building, aiming for a specific lux range that balances energy efficiency with occupant comfort. In the world of photography and cinematography, the word is part of the daily lexicon. A Director of Photography (DP) might ask their gaffer to 'bring the lux up' on a subject's face to achieve a certain exposure value. You will also hear it in hardware stores or when reading the packaging of specialized light bulbs, particularly those designed for 'smart homes' or 'mood lighting.' Manufacturers often include lux-sensing capabilities in their products, allowing lights to turn on automatically when ambient lux drops below a certain threshold.

Professional Architecture: Discussed during the planning phase to ensure buildings meet international lighting standards.

The architect explained that the atrium was designed to provide 2,000 lux of natural light during the day.

In the healthcare sector, specifically in sleep clinics and psychiatric wards, lux is a key topic of conversation. Doctors prescribe 'light therapy' with specific lux requirements to treat conditions like Seasonal Affective Disorder (SAD) or jet lag. You might hear a nurse explain to a patient, 'This light box provides 10,000 lux, which mimics the intensity of a bright morning.' Similarly, in workplace safety audits, inspectors use lux meters to ensure that stairwells, factories, and offices are sufficiently lit to prevent accidents. If a workplace is too dark, the inspector will cite the low lux levels as a violation of safety codes. You will also encounter the word in the tech industry, particularly in marketing materials for smartphones. Companies brag about their screens' 'peak brightness' in nits, but they also discuss 'ambient light sensors' that measure lux to adjust the screen brightness automatically. This ensures that the screen is readable in the 100,000 lux of direct sunlight and comfortable in the 1 lux of a dark bedroom.

Health and Safety: Used by medical professionals and safety inspectors to quantify environmental light for health and risk prevention.

Safety regulations dictate that the emergency lighting must provide at least 1 lux along the center line of the escape route.

In the automotive world, car enthusiasts and engineers talk about lux when comparing headlight performance. High-intensity discharge (HID) and LED headlights are often marketed based on how many lux they can project at a distance of 100 meters. On automotive forums, you might see users posting 'lux maps' of their headlights to show the beam pattern and intensity. Finally, in the field of environmental science, researchers measure lux levels in forests or oceans to study how light penetration affects ecosystems. They might discuss how the 'lux at the forest floor' influences the growth of shade-tolerant plants or how 'lux in the euphotic zone' of the ocean drives phytoplankton productivity. In all these contexts, lux is the bridge between the abstract concept of light and the concrete data needed for science, industry, and health. It is a word that signals expertise and precision.

Environmental Science: Measuring light penetration in various ecosystems to understand biological impacts.

The marine biologist noted that the coral reef received significantly fewer lux due to the increased turbidity of the water.

The 'Lux' setting on the motion-activated floodlight allows it to ignore movement during the day.

In the smart city project, streetlights adjust their lux output based on real-time traffic density.

The most frequent mistake people make with lux is confusing it with lumens. While they both relate to light, they measure different things. Think of lumens as the 'total amount of water coming out of a hose' and lux as the 'amount of water hitting a specific square inch of a target.' If you spread the same amount of light (lumens) over a larger area, the lux level decreases. People often mistakenly say, 'This bulb has 800 lux,' when they actually mean '800 lumens.' A bulb's output is measured in lumens; the brightness it creates on your desk depends on how far away the bulb is and is measured in lux. Another common error is failing to account for the inverse square law. Some assume that if you double the distance from a light source, the lux will be halved. In reality, doubling the distance reduces the lux to one-quarter of its original value. This is a crucial distinction for photographers and lighting engineers.

Lux vs. Lumen: Confusing the total light output (lumen) with the light intensity on a surface (lux).

Incorrect: 'I bought a 1000 lux light bulb for my lamp.' Correct: 'I bought a 1000 lumen light bulb.'

Grammatically, 'lux' is often treated as an invariant noun, meaning the singular and plural forms are the same. While 'luxes' is technically a word, it is rarely used in scientific or professional contexts. Saying '500 luxes' can sound amateurish to an expert; '500 lux' is the preferred form. Another mistake is confusing lux with nits (candelas per square meter). While both measure brightness, nits measure the light *emitted* by a surface (like a smartphone screen), whereas lux measures the light *falling onto* a surface. If you are describing how bright a phone screen looks, you should use nits. If you are describing how much light that phone screen is casting onto your face, you could use lux. This subtle difference is often lost in casual conversation but is vital for technical accuracy.

Lux vs. Nit: Confusing light falling on a surface (lux) with light emitted from a surface (nit).

Incorrect: 'The iPhone screen has a peak brightness of 2000 lux.' Correct: 'The iPhone screen has a peak brightness of 2000 nits.'

In the United States, the 'foot-candle' is still used in some industries. A common mistake for American students or professionals is to use lux and foot-candles interchangeably without conversion. One foot-candle is approximately 10.76 lux. Forgetting this conversion factor can lead to massive errors in lighting design—either making a room ten times too bright or ten times too dark. Additionally, people sometimes ignore the 'spectral' nature of lux. Lux is specifically designed to measure light as perceived by the human eye. It is not a measurement of total radiant energy (which would be measured in watts per square meter). Therefore, a high-intensity infrared light might have zero lux because the human eye cannot see it, even though it carries a lot of energy. Misunderstanding this can lead to mistakes in fields like botany or infrared photography where non-visible light is important.

The Human Factor: Failing to realize that lux only measures visible light, not infrared or ultraviolet radiation.

The UV lamp emitted high energy, but its lux reading was surprisingly low because most of its output was outside the visible spectrum.

The engineer corrected the intern, explaining that lux is the plural form as well as the singular in this report.

Using a lux meter at the wrong angle can lead to a false reading; it must be parallel to the surface being measured.

When discussing light, several terms are related to lux, but each has a specific nuance. The most direct alternative in the imperial system is the foot-candle. While lux is the lumen per square meter, the foot-candle is the lumen per square foot. Because a square meter is much larger than a square foot, one foot-candle is roughly equal to 10.76 lux. In the United States, you will still see foot-candles used in older building codes and by some lighting professionals, but lux is the international standard. Another related term is illuminance, which is the general scientific name for the phenomenon that lux measures. You might say, 'The illuminance of the room is 500 lux.' In this sentence, 'illuminance' is the property, and 'lux' is the unit. It is similar to saying, 'The distance is 5 meters.'

Lux vs. Foot-candle: Lux is metric (lm/m²), while foot-candle is imperial (lm/ft²). 1 fc ≈ 10.76 lux.

The project specs were converted from foot-candles to lux for the European contractors.

Another term often mentioned alongside lux is luminance (measured in nits or candelas per square meter). While illuminance (lux) is light *falling on* a surface, luminance is light *reflecting off* or *emitted from* a surface in a specific direction. Luminance is what we actually perceive as 'brightness' or 'glare.' For example, a white piece of paper and a black piece of paper might both have 500 lux falling on them, but the white paper will have a much higher luminance because it reflects more light. Understanding the difference between lux (input) and nits (output/reflection) is essential for advanced lighting design. Then there is the lumen, the unit of luminous flux. As discussed, the lumen measures the total light output of a source. If you have a light source of 1000 lumens and you focus it into a tight beam, the lux level in that beam will be very high. If you spread those same 1000 lumens across a whole room, the lux level will be very low.

Lux vs. Lumen: Lux is 'density' of light on a surface; Lumen is the 'total amount' of light from a source.

By using a reflector, we increased the lux on the subject without increasing the total lumens of the lamp.

In more casual settings, you might use words like brightness, intensity, or radiance. However, these are subjective or general terms. 'Brightness' is a psychological perception, not a physical unit. A room that feels 'bright' to someone coming from a dark cave might feel 'dim' to someone coming from the beach. Lux provides the objective measurement that removes this subjectivity. In scientific research involving plants, you might encounter PAR (Photosynthetically Active Radiation) or PPFD (Photosynthetic Photon Flux Density). These measure the number of photons useful for photosynthesis that hit a surface. While lux is weighted for human vision (green light looks 'brighter' to us), PAR measures the light plants actually use (mostly blue and red). For a botanist, 1000 lux of green light is useless, but 1000 lux of full-spectrum sunlight is great. This highlights why lux is specifically a 'human-centric' unit.

Lux vs. PAR: Lux measures light for human eyes; PAR measures light for plant growth.

While the lux levels were high, the plants struggled because the light lacked the necessary red wavelengths.

The photographer used a 1/100th shutter speed at 400 ISO to compensate for the low lux in the cathedral.

The 'Lux' value is the primary metric used in the LEED certification for indoor environmental quality.

How Formal Is It?

豆知識

The word 'lux' is the root of many English words related to clarity and light, such as 'lucid' (clear) and 'elucidate' (to make clear). It was officially adopted as an SI unit in 1948.

発音ガイド

UK /lʌks/

US /lʌks/

Single syllable, no primary stress variation.

韻が合う語

bucks ducks trucks clucks mucks pucks sucks tucks

よくある間違い

Pronouncing it like 'looks' (with an 'oo' sound).
Confusing it with 'luxe' (which is often pronounced 'luks' but means luxury).
Adding an extra syllable like 'lux-es' when it should be singular.
Pronouncing the 'x' as a 'z' sound.
Thinking it is an abbreviation and pronouncing letters L-U-X.

難易度

読解 3/5

Common in technical or scientific texts, but rare in fiction.

ライティング 4/5

Requires understanding of physics units to use accurately.

スピーキング 4/5

Mostly used by professionals (photographers, architects).

リスニング 3/5

Easy to hear, but can be confused with 'looks' or 'luxe'.

次に学ぶべきこと

前提知識

light unit measure area bright

次に学ぶ

lumen candela illuminance photometry inverse square law

上級

nit steradian luminous flux photopic scotopic

知っておくべき文法

Units of measurement as adjectives

A 500-lux lamp (note the hyphen).

Invariance of certain SI units

10 lux (not 10 luxes).

Prepositions with measurements

Measured in lux; at 500 lux.

Subject-verb agreement with units

Five hundred lux is (not are) the standard.

Quantifiers with technical nouns

Sufficient lux; excessive lux; minimal lux.

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レベル別の例文

The room has 500 lux.

La pièce a 500 lux.

Lux is used as a noun after a number.

Is the lux high or low?

Le lux est-il élevé ou bas ?

Using lux as a subject.

I see the word lux on the box.

Je vois le mot lux sur la boîte.

Direct object.

The sun gives many lux.

Le soleil donne beaucoup de lux.

Informal use of 'many' with lux.

This lamp has 200 lux.

Cette lampe a 200 lux.

Stating a measurement.

We need more lux here.

Nous avons besoin de plus de lux ici.

Using 'more' with lux.

The lux meter is green.

Le luxmètre est vert.

Compound-like usage.

Zero lux means it is dark.

Zéro lux signifie qu'il fait noir.

Defining a state.

The office has 500 lux of light.

Le bureau a 500 lux de lumière.

Using 'of light' to clarify.

You can measure lux with your phone.

Vous pouvez mesurer le lux avec votre téléphone.

Action verb with lux.

The street has only 10 lux at night.

La rue n'a que 10 lux la nuit.

Adverb 'only' with lux.

Plants need a lot of lux to grow.

Les plantes ont besoin de beaucoup de lux pour pousser.

Quantifier 'a lot of'.

Check the lux level on the table.

Vérifiez le niveau de lux sur la table.

Lux as a noun adjunct.

The lux is too low for reading.

Le lux est trop bas pour la lecture.

Predicate adjective 'too low'.

The bright sun is 100,000 lux.

Le soleil brillant est de 100 000 lux.

Large numbers with lux.

This app shows the lux in the room.

Cette application montre le lux dans la pièce.

Direct object in a clause.

The standard lux for a classroom is 300.

Le lux standard pour une salle de classe est de 300.

Lux as a technical standard.

If you move the light, the lux will change.

Si vous déplacez la lumière, le lux changera.

Conditional sentence.

We measured the lux levels in different corners.

Nous avons mesuré les niveaux de lux dans différents coins.

Plural-like 'levels' with lux.

Light therapy requires 10,000 lux for thirty minutes.

La luminothérapie nécessite 10 000 lux pendant trente minutes.

Specific requirement.

The lux decreases as you move away from the bulb.

Le lux diminue à mesure que l'on s'éloigne de l'ampoule.

Describing a physical process.

Is 200 lux enough for a kitchen?

Est-ce que 200 lux suffisent pour une cuisine ?

Interrogative with 'enough'.

The sensor detects changes in lux automatically.

Le capteur détecte automatiquement les changements de lux.

Scientific context.

The moon provides less than one lux of light.

La lune fournit moins d'un lux de lumière.

Comparative 'less than'.

The architectural plans specify a minimum of 500 lux for all workspaces.

Les plans architecturaux spécifient un minimum de 500 lux pour tous les espaces de travail.

Formal specification.

Excessive lux can lead to glare and eye fatigue.

Un lux excessif peut entraîner des reflets et une fatigue oculaire.

Discussing consequences.

The photographer adjusted the studio lights to reach the desired lux.

Le photographe a ajusté les lumières du studio pour atteindre le lux souhaité.

Professional application.

The greenhouse uses sensors to maintain a constant lux for the orchids.

La serre utilise des capteurs pour maintenir un lux constant pour les orchidées.

Biological control.

One lux is defined as one lumen per square meter.

Un lux est défini comme un lumen par mètre carré.

Formal definition.

The safety inspector noted that the stairwell's lux was below code.

L'inspecteur de sécurité a noté que le lux de la cage d'escalier était inférieur au code.

Regulatory context.

The screen's brightness is measured in nits, not lux.

La luminosité de l'écran est mesurée en nits, pas en lux.

Contrastive usage.

The stadium floodlights provide 2,000 lux for high-definition filming.

Les projecteurs du stade fournissent 2 000 lux pour le tournage en haute définition.

Industrial application.

The illuminance, measured in lux, is critical for ergonomic workplace design.

L'éclairement, mesuré en lux, est crucial pour la conception ergonomique du lieu de travail.

Appositive phrase.

The inverse square law dictates how lux diminishes over distance.

La loi de l'inverse du carré dicte comment le lux diminue avec la distance.

Scientific principle.

Morning exposure to high lux levels is proven to regulate circadian rhythms.

Il est prouvé que l'exposition matinale à des niveaux de lux élevés régule les rythmes circadiens.

Medical/Biological context.

The museum's lighting was restricted to 50 lux to preserve the delicate pigments.

L'éclairage du musée a été limité à 50 lux pour préserver les pigments délicats.

Conservation context.

We need to audit the lux distribution across the entire factory floor.

Nous devons auditer la distribution du lux sur tout le sol de l'usine.

Complex noun phrase.

The security camera features a 0.001 lux rating for low-light surveillance.

La caméra de sécurité présente une classification de 0,001 lux pour la surveillance en basse lumière.

Technical specification.

Calculations showed that the light well would provide sufficient lux even in winter.

Les calculs ont montré que le puits de lumière fournirait un lux suffisant même en hiver.

Predictive context.

The transition from 100,000 lux to 10 lux causes temporary photostress.

La transition de 100 000 lux à 10 lux provoque un photostress temporaire.

Physiological description.

The interplay between lux and luminance determines the overall visual comfort of an interior.

L'interaction entre le lux et la luminance détermine le confort visuel global d'un intérieur.

Abstract technical relationship.

Spectral power distribution affects how we perceive a given lux value.

La distribution de puissance spectrale affecte la façon dont nous percevons une valeur de lux donnée.

Advanced physics context.

The efficacy of the lighting system was evaluated in terms of lux per watt consumed.

L'efficacité du système d'éclairage a été évaluée en termes de lux par watt consommé.

Ratio-based measurement.

Environmentalists argue that excessive urban lux levels disrupt nocturnal ecosystems.

Les écologistes soutiennent que les niveaux de lux urbains excessifs perturbent les écosystèmes nocturnes.

Argumentative context.

The photopic response curve is the basis for the definition of the lux.

La courbe de réponse photopique est la base de la définition du lux.

Fundamental scientific basis.

Achieving a uniform 500 lux across a non-linear surface requires complex ray-tracing simulations.

Obtenir un lux uniforme de 500 sur une surface non linéaire nécessite des simulations complexes de lancer de rayons.

Engineering complexity.

The historical shift from candlelight to high-lux electric lighting fundamentally altered human sleep patterns.

Le passage historique de la lueur des bougies à l'éclairage électrique à haut lux a fondamentalement modifié les cycles de sommeil humains.

Historical/Sociological analysis.

In the absence of sufficient lux, the human eye shifts from photopic to scotopic vision.

En l'absence de lux suffisant, l'œil humain passe de la vision photopique à la vision scotopique.

Biological transition.

よく使う組み合わせ

lux level

minimum lux

ambient lux

target lux

lux meter

low lux

average lux

lux requirement

peak lux

lux sensor

よく使うフレーズ

lux rating

— The specification of a device's light performance.

The camera has a 0.1 lux rating.

lux output

— The amount of light a system provides to a surface.

We increased the lux output of the floodlights.

in terms of lux

— Using lux as the basis for comparison.

How does this bulb compare in terms of lux?

maintain lux

— To keep light levels constant.

The system helps maintain lux throughout the day.

lux calculation

— The mathematical process of determining light levels.

The lux calculation was based on the room's dimensions.

lux audit

— A formal check of lighting levels in a building.

The school conducted a lux audit last month.

high-lux environment

— A place with very bright light.

Working in a high-lux environment can cause glare.

lux sensitivity

— How a device or eye responds to light levels.

The sensor has high lux sensitivity.

lux distribution

— How light is spread across an area.

The lux distribution was uneven in the corners.

lux standard

— A recognized level of lighting for a specific purpose.

The new office meets the international lux standard.

よく混同される語

lux vs lumen

Lumen is total light output; lux is light intensity on a surface.

lux vs nit

Nit is light emitted from a surface; lux is light falling on a surface.

lux vs luxe

Luxe means luxury or expensive; lux is a unit of light.

慣用句と表現

"bring to light"

— To make something known or visible (metaphorical lux).

The investigation brought new facts to light.

general

"in a new light"

— To see something from a different perspective.

I now see the problem in a new light.

general

"light at the end of the tunnel"

— A sign of hope after a difficult period.

After months of work, we finally see the light at the end of the tunnel.

general

"blinded by the light"

— To be overwhelmed by something (often literal high lux).

The driver was blinded by the light of the oncoming car.

general

"shed light on"

— To provide information that makes something easier to understand.

Can you shed some light on this situation?

general

"light up the room"

— To have a very positive or charismatic presence.

Her smile really lights up the room.

general

"hide one's light under a bushel"

— To keep one's talents or accomplishments secret.

Don't hide your light under a bushel; show them what you can do!

general

"out like a light"

— To fall asleep or become unconscious very quickly.

As soon as his head hit the pillow, he was out like a light.

informal

"the light of one's life"

— Someone who is very much loved.

His daughter is the light of his life.

general

"sweetness and light"

— A state of perfect harmony or kindness (often used sarcastically).

After the argument, everything was sweetness and light again.

general

間違えやすい

lux vs Lumen

Both are units of light.

Lumen measures the source; lux measures the destination. Think of a showerhead: lumens is the water leaving the head, lux is the water hitting your skin.

The 1000-lumen bulb provided 500 lux on the table.

lux vs Candela

Both measure light intensity.

Candela measures intensity in a specific direction from the source; lux measures intensity on a surface area.

The candle has an intensity of 1 candela, which creates 1 lux at 1 meter.

lux vs Foot-candle

Both measure illuminance.

Lux is metric (per square meter); foot-candle is imperial (per square foot).

10 lux is roughly 1 foot-candle.

lux vs Watt

People used to judge brightness by watts.

Watt measures energy consumption; lux measures visible light intensity. Modern LEDs use fewer watts but provide the same lux.

This 10-watt LED provides the same lux as a 60-watt old bulb.

lux vs Nit

Both describe brightness.

Nits are for screens (emitted light); lux is for surfaces (received light).

The phone screen is 1000 nits, but it only adds 5 lux to the room.

文型パターン

The [noun] has [number] lux.

The room has 300 lux.

We need [number] lux for [activity].

We need 500 lux for reading.

The lux level is [adjective].

The lux level is too low.

The [noun] provides a minimum of [number] lux.

The lamp provides a minimum of 200 lux.

Measured in lux, the [noun] shows [result].

Measured in lux, the desk shows 450.

Due to the low lux, [consequence].

Due to the low lux, the plants died.

The [noun] is characterized by a lux value of [number].

The atrium is characterized by a lux value of 2000.

The correlation between [noun] and lux is [adjective].

The correlation between distance and lux is non-linear.

語族

名詞

lux

luxury (related root)

lucidity

lucifer (light-bringer)

動詞

elucidate

illuminate

形容詞

lucid

lucent

translucent

luminous

使い方

frequency

Common in technical fields; rare in everyday speech.

よくある間違い

Using 'lux' to describe a bulb's power. → Using 'lumens' for the bulb.
A bulb has a fixed lumen output, but the lux it creates depends on the room and distance.
Saying '500 luxes'. → Saying '500 lux'.
In professional and scientific English, the plural of lux is usually just lux.
Thinking 100 lux is twice as bright as 50 lux. → Understanding human perception is logarithmic.
While the lux is double, our eyes don't perceive it as exactly 'twice as bright'.
Measuring lux with the sensor facing the floor. → Facing the sensor toward the light source or parallel to the work surface.
Lux measures light *falling on* a surface, so the sensor must mimic that surface.
Ignoring the color of the light. → Considering the spectral distribution.
Two lights can have the same lux but look very different (e.g., warm yellow vs. cool blue).

ヒント

Inverse Square Law

Remember that if you double the distance from a light source, the lux level drops to one-quarter, not one-half.

Evening Light

Try to keep your environment below 50 lux in the hour before bed to help your body prepare for sleep.

Layering Light

Combine different light sources to reach your target lux without creating harsh shadows or glare.

Exposure Accuracy

Use a lux meter to ensure your lighting is consistent across different parts of your set.

Check the Corners

When auditing a room, measure the lux in the darkest corners, not just directly under the lights.

Light Quality

High lux is good, but make sure the light has the right spectrum (colors) for your specific plants.

Efficiency

Use reflectors to direct light where you need it, increasing the lux without using more power.

Bulb Shopping

Look for lumens on the box to know the power, but think about lux to know if it will light your desk.

Visualizing

Try to associate specific lux numbers with places you know (e.g., 50 lux = dim restaurant).

Quick Checks

Use a free lux meter app to quickly compare the brightness of different spots in your home.

暗記しよう

記憶術

LUX is Light Under X-ray (or just think: LUX = Lumens Under X-area).

視覚的連想

Imagine a 1-meter square box on the floor. Now imagine pouring one 'lumen' of liquid light into it. That depth is one lux.

Word Web

light unit area lumen brightness meter vision physics

チャレンジ

Go into three different rooms in your house and guess the lux level, then use a phone app to check if you were right.

語源

Derived from the Latin word 'lux', which simply means 'light'.

元の意味： In Latin, 'lux' referred to the brightness of the sun, a lamp, or even the 'light of life'.

Indo-European (Italic branch).

文化的な背景

No specific sensitivities, but be careful not to confuse it with 'luxe' (luxury) in fashion contexts.

Commonly used in professional settings like engineering, photography, and interior design.

Yale University motto: Lux et Veritas Fiat Lux (Let there be light) from the Bible Lux soap brand

実生活で練習する

実際の使用場面

Office Design

standard lux levels
desk illuminance
glare reduction
natural light lux

Photography

low-light lux
exposure value
lux meter reading
studio lighting lux

Safety Audits

minimum lux requirement
emergency lighting lux
stairwell illuminance
safety code compliance

Gardening

plant lux needs
grow light output
indirect lux
full sun lux

Smartphone Specs

ambient light sensor
screen lux adjustment
low-lux camera performance
peak brightness

会話のきっかけ

"Do you think the lux level in this office is high enough for working all day?"

"Have you ever used a lux meter app to check the lighting in your house?"

"Why do you think hospitals use such high lux levels in operating rooms?"

"How does the lux of a full moon compare to a streetlamp in your opinion?"

"Do you prefer working in a high-lux environment or a more dimly lit space?"

日記のテーマ

Describe how the lux levels in your environment change from morning to night and how it affects your mood.

If you were an architect, how would you use natural light to reach 500 lux in a basement?

Write about a time you were in a very low-lux environment and how you felt.

Research the lux requirements for your favorite hobby (e.g., painting, gaming) and explain why they are necessary.

Discuss the impact of high urban lux levels on the visibility of stars in the night sky.

よくある質問

10 問

A bright sunny day can reach up to 100,000 lux. In contrast, an overcast day might only be 1,000 lux.

Yes, 500 lux is the standard recommended level for general office work and reading.

Yes, there are many apps that use the phone's ambient light sensor to provide a lux reading, though they may not be as accurate as professional meters.

Lumens measure the total light produced by a bulb. Lux measures how much of that light hits a specific area.

It depends on the plant. Shade plants might need 1,000 lux, while sun-loving plants might need over 10,000 lux.

Not exactly. Lux is a physical measurement, while brightness is how a human perceives that light.

0.1 lux is roughly the amount of light provided by a full moon on a clear night.

High lux levels (especially blue light) tell your brain to stop making melatonin, which keeps you awake.

A lux meter is a handheld device with a sensor that measures the intensity of light hitting it.

Yes, it is the plural of lux, but in technical writing, 'lux' is usually used for both singular and plural.

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