LED lighting flicker and glare determine comfort
LED comfort is very important and will have an impact on people's physical and mental health. Insufficient lighting for a long time will cause visual tension, making the body easy to fatigue, distraction, memory decline, and reduced abstract thinking and logical thinking. Excessive sunlight exposure not only makes people feel uncomfortable psychologically, but also damages the cornea. Light pollution in urban lighting affects people's rest and sleep. Therefore, modern society should pay special attention to healthy lighting and pursue safety and comfort.
What factors determine the comfort of LED lighting?
For specific lamps, there are three main reasons for affecting comfort.
1. flicker
Currently used electric light sources such as straight tube fluorescent lamps (inductive), incandescent lamps, high-pressure mercury lamps, and sodium lamps, the electric power frequency of the wave source of the luminous flux to drive the electric light source illuminator to emit light should be above 40kHz (1,000 cycles) (CE certification stipulates that at 40kHz above) to avoid the stroboscopic effect. However, the driving electric power frequency of electronic straight tube fluorescent lamps and most energy-saving lamps on the market is only about 20kHz, or even as low as 15kHz. The luminous flux still has a fluctuation of 25% to 35%, which is called stroboscopic. The hazard caused by stroboscopic is called stroboscopic effect. The stroboscopic effect is essentially
light pollution. For the LED tube, because it is powered by a constant current source, there is no stroboscopic problem.
2. Glare
Glare is a visual condition in which there is a particularly bright light in the visual range that forms a strong brightness contrast with normal vision, causing visual discomfort and reducing the visibility of objects to the human eye. Glare is one of the important causes of visual fatigue. Glare is a visual condition that is caused by an inappropriate distribution of brightness within the field of view, or because the brightness varies too much, or because of extreme contrasts in space or time, which cause discomfort or reduce the ability to observe objects. ability. The GB 50034-2004 standard stipulates that the uncomfortable glare of common rooms or places in public buildings and industrial buildings should be evaluated by the unified glare value (UGR), and the uncomfortable glare of outdoor sports venues should be evaluated by the glare value (GR). The calculation method and maximum allowable value of glare value and glare value, for example, the UGR value requirement in commercial building lighting standards is generally 22.
3. Color rendering
The color of the light should be the color of sunlight. In this way, when viewing the color of the surface of the object, there will be no color shift or discoloration, and the original color of the surface of the object can be displayed. The larger the color rendering index R value of the light source, the better the color rendering performance of the light source. At this point, most LEDs now use blue-emitting chips and yellow-emitting phosphors to form white light. This spectrum is different from the natural spectrum, so the color rendering index is not high enough, and there is still a long way to go.
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