Living · 6 pages · 12 min
How blue light is a weak cue next to the sun
A screen can be bluish and still be a small signal next to daylight.
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From the opening
Blue light is a weak circadian cue next to the sun because the clock reads how much light reaches the eye, not only the color name. A screen can emit short wavelengths and still deliver far less light than outdoor daylight. The opening covers melanopsin cells report to the clock, brightness outweighs the color name, and daylight anchors more than screens.
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Inside
- Melanopsin cells report to the clock
- Brightness outweighs the color name
- Daylight anchors more than screens
- A screen counts more in darkness
- Where the idea stops applying
- A distinction worth keeping
Sources
- Melanopsin cells as circadian light sensors
- Light intensity and timing as the main zeitgebers