Light as a Support for Alertness and Other Cognitive Functions
The study confirmed that light exposure during the previous 30 to 120 minutes has an immediate effect on how quickly the brain processes information. At intensities comparable to natural daylight, reaction times in alertness tests were reduced by 30 milliseconds (approximately 7% faster), while working memory test performance improved by as much as 60 milliseconds (approximately 8% faster). Higher light intensity also reduces the subjective feeling of sleepiness.
A Long-Term Investment in a Stable Circadian Rhythm
This study demonstrates that light is not just about one-time exposure, but also about a long-term strategy. Consistent exposure to daylight throughout the day also promotes earlier sleep onset and better sleep quality. This regular light pattern then supports cognitive functions throughout the day.
However, if we cannot spend enough time outdoors, lighting that most closely replicates the spectrum of natural daylight may provide a suitable alternative, such as full-spectrum pro-cognitive lighting. This helps create appropriate indoor lighting conditions and supports natural biological processes that influence our alertness, concentration, and ability to rest effectively. In the long term, it may contribute to a healthier daily routine and better overall functioning of the body.
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