不同波段LED对人体非视觉的影响

The impacts of different wave range LED on non-visual effects

采用生物节律因子模型,评价可控发光二极管(light-emitting diode,LED)光源对人体生理节律等非视觉的影响.计算9种颜色LED光的生物节律因子,在红绿蓝3种光环境下,记录人体的心电图参数及9种颜色LED光开灯前后的额头平均温度差,结果发现,不同的颜色光对应着不同的生物节律因子,蓝光的生物节律因子最大,红光的最小;在红绿蓝3种颜色光环境下测得的心电图数据显示,在蓝光环境下心室率及QTc时间等参数变化较大,在红光和绿光环境下则基本变化不大;在9种颜色的光环境下,蓝光开灯前后额头平均温度差最大,红光的较小,白光的最小,生物节律因子与开灯前后额头平均温度差总体呈正相关,不同生物节律因子对人体非视觉效应存在不可忽视的影响.

The non-visual effects of controllable LED light source on human circadian rhythms were evaluated by using a model of the circadian factor. The circadian factors of a nine-color LED light were calculated. The parameters of participants＇ electrocardiogram in the blue, green and red lights and the average temperature differences before and after turning on the lights in the nine-color light were recorded. Results show that the circadian factor of blue light is maximum and that of red light is minimum. Different color lights give different circa- dian factors. In the blue, green and red lights, the measured electrocardiogram data show ventricular rate, and QTc period show nearly no change in the red and green light. Comparatively, great changes were shown in the blue light. In the blue color light, the average temperature difference is maximum, while small in the red light and minimum in the white light. On the whole, the circadian factors are positively correlated with the average temperature difference. The impact of which different circadian factors have on non-visual effect cannot be ignored.