With the recent advances in photobiology research and light-emitting diode technology, considering the circadian effects and the potential health benefits of lighting has attracted much attention. In this work, to achieve a white light-emitting LED cluster with beneficial and tunable circadian effects, a red-green-blue-warm white colour-mixing method based on pulse width modulation has been introduced and developed. Five optimal spectral power distributions were achieved with the correlated colour temperatures of 2700, 4000, 5000, 6500 and 8000 K that provide maximum colour-rendering indices of 95.0, 96.6, 96.8, 95.6 and 93.5 for each correlated colour temperature. Moreover, the Bellia model was modified to take into account the reduction in spectral transmittance of the human eye that occurs with age. Using the five spectral power distributions, based on the eye spectral transmittance with age-related change, we studied the change of the circadian effect with corneal illuminance at the different correlated colour temperatures. Solutions are provided for scenarios where circadian effect should be avoided for different age groups while the reasonable illuminance and colour temperature are maintained.

中文翻译：

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不同年龄昼夜节律效应随色温和眼睛光谱透射率的变化

随着光生物学研究和发光二极管技术的最新进展，考虑到昼夜节律效应和照明对健康的潜在益处已经引起了广泛关注。在这项工作中，为了实现具有有益和可调昼夜节律效应的白光 LED 簇，引入并开发了一种基于脉冲宽度调制的红-绿-蓝-暖白色混合方法。使用 2700、4000、5000、6500 和 8000 K 的相关色温实现了五种最佳光谱功率分布，为每个相关色温提供 95.0、96.6、96.8、95.6 和 93.5 的最大显色指数。此外，对 Bellia 模型进行了修改，以考虑随着年龄增长而发生的人眼光谱透射率的降低。使用五个光谱功率分布，基于眼睛光谱透射率随年龄的变化，我们研究了昼夜节律效应随角膜照度在不同相关色温下的变化。针对不同年龄段应避免昼夜节律效应，同时保持合理的照度和色温的场景，提供了解决方案。