Study

A meta-study by Beijing Jiaotong University proves the effectiveness of daytime exposure to artificial lighting on alertness and cognitive function

About study

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Title:

Diurnal Intervention Effects of Electric Lighting on Alertness, Cognition, and Mood in Healthy Individuals
Author: YanJie Li, WeiNing Fang, HanZhao Qiu, WenLi Dong, JianXin Wang & HaiFeng Bao Beijing Jiaotong University, Beijing, China
Date: 1. December 2023
Source: https://doi.org/10.1080/15502724.2023.2279946
PDF: Diurnal Intervention Effects of Electric Lighting on Alertness, Cognition, and Mood in Healthy Individuals.PDF

Brief summary

Scientists from Peking University, through a meta-analysis of 28 studies, provide evidence that the intensity, color temperature, and spectral composition of lighting have significant effects on alertness, cognition, and recognition. Changes in daylight, including illuminance, CCT, SPD, and time characteristics (such as light exposure in the morning versus afternoon), significantly reduced alpha wave activity. These waves are associated with states of relaxation, calmness, or meditation. A lower level of alpha waves therefore confirms that adjustments to daylight lighting lead to increased activity and alertness. These insights can be a valuable tool for enhancing attention and cognitive abilities throughout the day in work and educational environments with the use of full-spectrum lighting.

The meta-analysis found a positive effect on subjective alertness, cognitive performance and objective alertness (reaction time).

The results of the meta-analysis show that high light levels (≥1000 lx) have a significant effect on improving alertness compared to low light levels (≀200 lx). In addition, short-wavelength or cyan-enriched light (λmax ≀ 480 nm) was found to have a significant effect on cognitive improvement compared to medium- or long-wavelength light (λmax > 500 nm).

Daytime electric light (DEL) has a small significant suppressive effect on the alpha wave of the electroencephalogram (EEG)

Research results showed that daily exposure to electric light had a small significant effect on alpha wave reduction. This finding shows that the use of daytime light interventions can significantly improve levels of alertness, arousal and cognition. For the best effects, the authors also recommend using electric lighting, which mimics the characteristics of natural daylight.

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