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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机译：基于昼夜节律和基于视觉性能的介观测光系统被用于优化用于低照度照明应用的固态光源的光谱功率分布（SPD）。在室外照明的典型中观适应亮度（0.1-2 cd / m〜2）下，通过最小化中观昼夜节律作用因子来获得最佳SPD，这是辐射的昼夜节律功效与辐射的近观夜光功效之比。 。对于低于约3000 K的相关色温，与高压钠灯和普通的暖白色LED相比，优化的双色发光二极管（LED）具有较低的昼夜节律危害。它们还可能更有效，并且在介观条件下具有可接受的显色性。
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