pxt-calliope/docs/lessons/night-light/quiz-answers.md

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# night light quiz answers
Answers to the night light quiz. #LED #image #brightness #fade #docs
This is the answer key for the [night light quiz](/microbit/lessons/night-light/quiz).
## 1. Define the function "set brightness"
This function sets the brightness of the LED screen.
## 2. Consider the following image
![](/static/mb/lessons/night-light-0.png)
If the rectangle above represents the BBC micro:bit, write the code to set all the LEDs to full brightness and to turn on all the LEDs.
<br />
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```blocks
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led.setBrightness(255)
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basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
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```
## 3. Consider the following image
![](/static/mb/lessons/night-light-1.png)
If the rectangle above represents the BBC micro:bit, write the code to set the screen brightness to 50% (128) and turns on all the LEDs.
<br/>
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```blocks
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led.setBrightness(128)
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basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
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```
## 4. Consider the following image
![](/static/mb/lessons/night-light-2.png)
If the rectangle above represents the BBC micro:bit, write the code to turn off all the LEDs.
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```blocks
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led.setBrightness(0)
```