ICNIRP Statement on Short Wavelength Light Exposure from Indoor Artificial Sources and Human Health

Abstract

Overview

Concerns about the potential health effects of exposure to short wavelength light (SWL) from indoor artificial sources on human health are explored. SWL is defined as light with wavelengths between 380-550 nm.

Human Sensitivity and Circadian Impact

The human circadian timing system shows the greatest sensitivity to light at around 480 nm, significantly different from the peak sensitivity of daylight vision centered at 555 nm.

Experimental Studies and Public Health Perspective

Various experimental studies have indicated an influence of SWL exposure on the circadian system and sleep, particularly when this exposure occurs during the evening or night. However, there is a lack of consensus among public health officials about the extent to which SWL disruption from artificial sources is linked with adverse health outcomes.

Review Findings

• Systematic reviews reveal conflicting data regarding the impact of SWL on sleep and overall human health.
• Older studies often used photometric quantities that may not accurately reflect actual SWL exposure levels relevant to human circadian biology.
• Adequate measurement techniques for assessing light impact on the intrinsically photosensitive retinal ganglion cells (important for circadian regulation) are highlighted as lacking.

Epidemiological Studies and Future Directions

Detailed long-term studies on the chronic effects of SWL are currently absent. An evaluation of existing data gaps is recommended to shape the framework and methodology of future research, potentially leading to the development of exposure guidelines.

ICNIRP's Recommendations

The International Commission on Non-Ionizing Radiation Protection (ICNIRP) advocates for improved quality in upcoming studies to define clearer resolutions regarding SWL's potential health risks.