Analysis of the potential impact of LED light on the heart: blue, red and green light

Due to the discovery of human third photoreceptor cell ipRGC (Intrinsically Photosensitive Retinal Ganglion Cell), the relationship between light source and human physiological health has been further emphasized. Recent studies have found that light has the function of regulating human circadian rhythm.

Brainard et al. used eight kinds of monochromatic light to illuminate the testers at night, and found that different monochromatic lights have different inhibitory effects on melatonin content, and based on the experimental results, a spectral light efficiency curve based on melatonin was drawn. Studies by Mariana et al. showed that under 40 lx red and blue light, the human heart rate increased, and the amplitude of the alpha wave in the EEG decreased under the illumination of 10 lx red and blue light, while the amplitude of the beta wave increased. By using different wavelengths of light to illuminate the human eye, Christian et al. found that short-wave illumination is more pronounced than long-wave changes in body temperature and heart rate. Chai Yingbin et al. studied the changes in heart rate of humans under low illumination (about 75 lx at the human eye) and found that there were differences in heart rate changes caused by light of different colors at low illumination levels.

All the above experimental results show that the wavelength of the light source is an important factor affecting the biological effect, indicating that light is a potential physiological, behavioral and therapeutic incentive for the human body. Recent medical and biological studies have confirmed that the natural variation in the daily content of melatonin in the blood not only affects the mental state, but may also cause serious health problems such as premature aging, sexual dysfunction, and breast cancer after prolonged accumulation.

The spectroscopy sensitivity of the sinus rhythm of the narrow-band light source has been well studied. The design of the light source has been able to guide the non-visual biological effects of light. With the popularization of artificial lighting, many cities have become never-night cities, and the night is low. Illumination light also affects the physiology of human body. Based on the spectral light efficiency curve defined by Brinard et al. in the study of melatonin inhibition, the physiological effects of nighttime weak light source on human ECG (Electro-cardiograph) are analyzed through experimental tests. .

Biological rhythm factor

The various types of photoreceptor cells in the human eye respond differently to different spectral sources, and the biological rhythm factor can be introduced by the concept of luminous flux to evaluate the biological effects of light. The hollow dot in Fig. 1 is the spectral sensitivity of human circadian rhythm according to the inhibition of melatonin by Rea et al. The visual curve B(λ) is the 4th-order fitting curve, and the visual visual curve V(λ) is the bright vision. The spectral light efficiency curve below. It can be seen from Fig. 1 that the peak of the fitted B(λ) curve is around 460 nm, which is shifted to the short-wave direction with respect to the bright-view curve V(λ), and is in the blue portion, which is the spectral band rich in most white LEDs. The biorhythm factor can be defined by the bright curve V(λ) and the fitted B(λ) curve.

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