Is my room dark enough
for sleep?
—
Check if your bedroom is too bright for sleep.
Point the rear camera into your room.
Keep your phone still.
About this reading
A lower score means a darker camera image. Keep your phone, framing and screen brightness unchanged when comparing lights on and off.
We sample the centre of the rear camera image, convert the pixels to linear brightness, and combine their red, green and blue values. Green carries more weight to reflect how our eyes perceive brightness. The average is scaled from 0 to 100: lower means darker.
To smooth out brief changes, the score uses the middle value of up to five recent samples.
- Below 0.3
- Very dark
- 0.3 to below 3
- Fairly dark
- 3 to 10
- A little bright
- Above 10
- Too bright