Improving solid-state lamps for eye-friendly low-light vision

At mesopic adaptation luminances of 0.1-2 cd/m², optimized spectral power distributions may reduce circadian hazards.

• Optimized spectral power distributions were derived using circadian and visual-performance-based systems of photometry.
• Minimizing the mesopic circadian action factor is key to achieving optimal lighting for low-illuminance applications.
• Light-emitting diodes (LEDs) with correlated color temperatures below ~3000 K may present lower circadian hazards compared to high-pressure sodium lamps.
• These optimized LEDs could be more efficacious and maintain acceptable color rendition properties in mesopic conditions.

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