High quality light sources are the basis for green lighting when selecting lamps. High-quality light sources should have the following three characteristics.
First, there should be no ultraviolet light or infrared light in the spectral composition. Excessive exposure to ultraviolet light for a long time is not only easy to cause keratitis, but also causes damage to the lens, retina, choroid, and the like. Infrared rays are easily absorbed by water, and too much infrared light is absorbed in a large amount when the lens of the human eye is concentrated. Over time, the lens will be denatured, resulting in cataracts.
Second, the color temperature of light should be close to natural light. People live in natural light for a long time, and the human eye has strong adaptability to natural light and good visual effects.
Third, the light is no-frequency flash. The normal fluorescent lamp has a power supply frequency of 50 Hz, which means that the light is emitted 100 times per second when it emits light. It belongs to the low-frequency stroboscopic light, which causes the human eye's regulating organ to be in a state of tension regulation, resulting in visual fatigue. If the frequency of illumination increases to hundreds or more tens of thousands of Hertz---becoming a high frequency, the human eye will not have a stroboscopic feeling; but the true stroboscopic is a DC-powered or semiconductor solid-state light-emitting device (such as an LED light-emitting diode). The light emitted is called a no-strobe flash.
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