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Updated: Sep 27, 2025

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
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Impact of daytime spectral tuning on cognitive function.

Renske Lok1, Daniel S Joyce2, Jamie M Zeitzer3

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PubMed
Summary

Daytime exposure to broad-spectrum LED light can enhance cognitive function. This study found direct improvements in cognition, not linked to alertness changes from light exposure.

Keywords:
AlertnessCircadianCognitionHumanLightMelanopsinMemorySleep

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Area of Science:

  • Chronobiology
  • Human Cognition
  • Photobiology

Background:

  • Light at night (LAN) impacts alertness and cognition.
  • Daytime light exposure effects on cognition are less understood.
  • Daytime light may influence alertness and mitigate LAN effects.

Purpose of the Study:

  • To investigate the impact of different daytime lighting conditions on cognitive performance.
  • To assess the effect of daytime light on evening alertness.
  • To determine if daytime light exposure alters the impact of evening light on alertness.

Main Methods:

  • A within-subject crossover design study involving nine healthy individuals.
  • Four lighting conditions: dim fluorescent, room fluorescent, broad-spectrum LED, and standard white LED (100 lx).
  • Participants received 10-hour daytime light exposure followed by bright evening light, with regular cognitive and alertness assessments.

Main Results:

  • Daytime alertness was not significantly affected by different light exposures.
  • Broad-spectrum LED light exposure during the day improved specific aspects of cognitive performance.
  • Pre-exposure to various daytime lighting conditions did not mitigate the effects of bright evening light on alertness.

Conclusions:

  • Daytime exposure to white light with high melanopic efficacy shows potential for improving cognitive function.
  • Cognitive enhancements from specific daytime lighting appear to be direct effects.
  • Daytime light conditions did not alter the impact of subsequent evening light exposure on alertness.