First, the lighting without Flash. Power supply frequency is 50 Hz fluorescent which glows bright and dark 100 times per second, so is a low frequency of stroboscopic light, but also makes accommodation organs in the nervous regulation of State and likely to cause visual fatigue. If the frequency of light can give rise to hundreds of, tens of thousands of cycles per second more than high frequencies, so people won't feel the strobe; but really no strobe is DC powered or semiconductor solid state light emitting device (such as LED light-emitting diodes) light emitted is also a Flash-free, so when consumers purchase LED lights, be sure to pay special attention to this point.

Second, LED according to the spectral composition of the light there is no ultraviolet light and infrared light. Because the long accepted too much ultraviolet light, very easy to not only cause keratitis, will also cause damage to the lens, retina, choroid. Infrared light is easily absorbed by the water, while too much infrared light is gathered after human lens when being absorbed in large quantities, time lens degeneration can occur, leading to cataracts.

Third, the colour temperature of LED lamps must be close to the natural light. Because people live in natural light for a long time, so adaptable to natural light to the human eye, Visual effects. Because LED lamp color temperature a lot, there are white, Leng Baiguang, warm light, and so on, so when consumers in the purchase, be sure to choose one himself, looked the most comfortable lighting color temperature, and will not cause damage to the eyes.