The Biological Role of Light and Circadian Rhythm Regulation
The study confirms that light is a key factor influencing the body’s internal clock. Researchers identified the highest sensitivity of the human circadian system to short-wavelength blue and cyan light in the range of 420–480 nm, which can suppress the production of melatonin, the hormone responsible for regulating sleep. The study highlights that exposure to blue-enriched light during the day supports alertness and cognitive performance. In contrast, exposure during the evening can disrupt circadian rhythms and make sleep and recovery more difficult.
The research also found that an eight-hour shift schedule aligns better with employees’ circadian rhythms than a 6/12 shift system, resulting in lower fatigue levels and improved sleep quality.
Benefits for Modern Work Environments
The study’s findings extend beyond military applications. They support current evidence that pro-cognitive and circadian-oriented lighting can positively influence concentration, psychological well-being, and workplace performance in offices, manufacturing facilities, healthcare environments, and other operations involving shift work. Light therefore becomes an active tool for supporting human health and performance.
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