blueenriched

Blueenriched refers to lighting that has a higher proportion of blue wavelengths compared with standard indoor lighting. It is typically associated with a higher correlated color temperature (CCT) and a spectral distribution that emphasizes wavelengths around 460–480 nanometers.

Use and implementation vary, but blueenriched lighting is studied for daytime alertness, mood, and cognitive performance. It is commonly applied in offices, schools, healthcare facilities, and control rooms, often through tunable white lighting that shifts toward cooler, blue-rich settings during the day or via fixed high-CCT fixtures. The goal is to support wakefulness and task performance during daylight hours.

Physiological effects are linked to melanopsin-containing intrinsically photosensitive retinal ganglion cells, which respond strongly to blue light. Daytime exposure to blue-enriched light can suppress melatonin, increase alertness, and enhance certain cognitive and perceptual performance measures. The magnitude of these effects depends on light intensity, duration, timing, and individual differences, such as age and baseline circadian phase.

Timing and safety considerations are important. While blueenriched lighting can be beneficial during daytime, exposure in the evening or at night can delay circadian phase, shorten sleep onset latency, and impair sleep quality. To mitigate this, many environments employ dynamic lighting that reduces blue content in late afternoon and evening or transitions to warmer tones at night to preserve sleep.

Measurement and design guidance often use metrics such as CCT, spectral power distribution, and melanopic lux to estimate circadian impact. Effective blueenriched schemes balance visual performance with circadian and comfort considerations. See also circadian lighting and blue light.