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Circadian lighting does not reliably raise daytime alertness
The measured gains are sleep and mood: Boubekri and colleagues recorded 37 minutes more sleep under optimised daylight; on daytime alertness Grant reported a gain in 2021 and Schöllhorn found none in 2023.
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The evidence behind this sheet
23 factorsheets carry the studies for and against, each with how firm that evidence is.
- Circadian lighting probably raises sleep quality.
- mel-EDI (Melanopic EDI) raises sleep quality.
- Colour temperature probably raises sleep quality.
- Colour temperature probably lowers error rate.
- Circadian lighting probably raises circadian alignment.
- Colour temperature probably lowers fatigue.
- Colour temperature has a non-linear effect on mood.
- Colour temperature has a non-linear effect on visual comfort.
- mel-EDI (Melanopic EDI) probably raises circadian alignment.
- mel-EDI (Melanopic EDI) probably lowers fatigue.
- Colour temperature probably raises circadian alignment.
- Colour temperature has a non-linear effect on comfort.
- The evidence is very uncertain whether colour temperature affects working memory.
- The evidence is very uncertain whether mel-EDI (Melanopic EDI) affects visual comfort.
- Circadian lighting probably lowers fatigue.
- The evidence is very uncertain whether circadian lighting affects visual comfort.
- The evidence is very uncertain whether colour temperature affects heart rate.
- The evidence is very uncertain whether colour temperature affects satisfaction.
- Colour temperature probably raises information processing.
- Circadian lighting shows no effect on sustained attention.
- The evidence is very uncertain whether mel-EDI (Melanopic EDI) affects mood.
- Colour temperature has a non-linear effect on cognitive control.
- Circadian lighting probably raises mood.