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# night light lesson
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change the brightness of the BBC micro:bit.
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## Topic
Set Brightness
## Quick Links
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* [activity ](/lessons/night-light/activity )
* [challenges ](/lessons/night-light/challenges )
* [quiz ](/lessons/night-light/quiz )
* [quiz answers ](/lessons/night-light/quiz-answers )
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## Prior learning/place of lesson in scheme of work
Learn how to **set brightness** of an image `set brightness` to set the brightness of the LED screen. We will be learning how to set the brightness of the LED screen using LED show LEDs, on button pressed and set brightness.
## Documentation
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```cards
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led.setBrightness(255)
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input.onButtonPressed(Button.A, () => {})
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basic.showLeds(`
. . . . .
. . . . .
. . # . .
. . . . .
. . . . .
`)
```
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## Objectives
* learn how to set the brightness of the LED screen
* learn how to run code when an input button is pressed
* learn how to turn on all LEDs
