LED technology has changed the lighting industry, it brings more energy-saving and bright lighting. But some people worry that the new technology may cause glare problems. Darkness at night can cause eye strain, and sudden bright street lights can distract attention and can cause eye irritation and even pain. A group of researchers assessed the effects of glare on people in China and the Netherlands. They created a model that responded to driver discomfort under various lighting conditions. The team announced the results of the study, which may guide the layout and design of street lights.
"With the development of the LED industry, there is no doubt that more and more LED lights are used for road lighting," said Lin Yandan, associate professor of visual and color research at Shanghai Fudan University. “We believe that the lighting industry needs to address the problem of unpleasant glare caused by LED street lights.†For example, LEDs are designed to emit the same amount of light from a smaller area, which may increase uncomfortable glare. In addition, white LED lights generally have more energy in the blue portion of the spectrum, and blue light is more likely to cause glare at the same level of light perception. The researchers found that vertical illuminance is the most significant factor affecting glare. At the same time, in order to minimize uncomfortable feelings, they suggest to reduce the light and background brightness as much as possible, and to form a good contrast brightness through careful arrangement.
Researchers hope their models can be used by the construction company for design and LED street lamp replacement and installation. The team then planned to study the physiological changes caused by glare, such as eye movements and pupil size. Lin Yandan said: "Glare has a great influence on the normal visual function, causing serious threats and safety. The cumulative effect of glare also threatens the physical health of the body. Therefore, it is very important to reduce road glare."
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