Optimization of solid-state lamps for photobiologically friendly mesopic lighting

No SJR dataDec 25, 2012Applied optics

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

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Abstract

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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The circadian and visual-performance-based mesopic systems of photometry were applied for the optimization of the spectral power distributions (SPDs) of the solid-state sources of light for low-illuminance lighting applications. At mesopic adaptation luminances typical of outdoor lighting (0.1-2 cd/m(2)), the optimal SPDs were obtained through the minimization of the mesopic circadian action factor, which is the ratio of the circadian efficacy of radiation to mesopic luminous efficacy of radiation. For correlated color temperatures below ~3000 K, the optimized dichromatic light-emitting diodes (LEDs) are shown to pose a lower circadian hazard than high-pressure sodium lamps and common warm white LEDs; also they are potentially more efficacious and have acceptable color rendition properties under mesopic conditions.

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