基于生物节律因子的理论，运用控制变量的实验方法，使用低照度彩光 LED 照射被测试人员，记录人体心电图数据，研究非视觉生物效应中低照度下不同颜色 LED 灯对人体生理作用的影响，发现:低照度下光源对于人体的心电图有一定影响;照明光源的波长影响人体心脏心电图参数，蓝光明显加快人体心率，红光和绿光对心室除极与复极的时间影响较大;3 种光源下心室除极与复极时间校正值均有所增加．

On the basis of the biological equivalent theory，the control variable method is used to measure the elec-trocardiograms (ECGs) of testees under low-illumination LED lights with different colors and to explore the corre-sponding non-visual biological effect on human body’s physiological function． The results show that low-illumina-tion light source has certain effect on human electrocardiograms; and that the wavelength of low-illumination light source influences human ECG parameters． For instance，blue light significantly speeds up human heart rate while red and green lights have relatively greater effect on the depolarization and repolarization of the ventricle． Moreover，it is also found that both the depolarization time and the repolarization time increase under the illumination of these three kinds of light sources．