das Licht anmachen

The verb here is anmachen. It is a separable verb. This means the an part moves to the end. You say: Ich mache das Licht an. It sounds very natural this way. You can also use it for electronic devices. But for lights, it is the classic choice.

Use it when you enter a dark room. Use it when you want to read. You can say it to your roommate. You can say it to your boss. It works everywhere. It is perfect for the office or home. If you're looking for your keys, say it!

Do not use it for candles. For candles, you should use anzünden. Also, be careful when using it with people. Jemanden anmachen can mean to flirt. It can also mean to provoke someone. Stick to the light bulbs to stay safe! You don't want to accidentally flirt with your lamp.

Germans love their 'Gemütlichkeit' or coziness. They often prefer warm, indirect light. You won't see many bright overhead lights in German living rooms. They prefer small lamps for a warm vibe. Turning on the light is the start of a cozy evening. Just don't leave it on when you leave the room. Germans are very energy-conscious!

You might hear Licht einschalten. This sounds a bit more technical or formal. In a hurry, you can just say Licht an!. It is short and very clear. If you want the light off, say Licht ausmachen. It is the exact opposite action.