[Source: Gaogong LED 's " LED Good Products" magazine March issue ]
The local government has made great efforts in the LED industry support. A certain district of the city announced that it will complete the renovation of LED projects at the end of this year (2013), including the public lighting sector, namely urban roads, public places, government agencies, state-owned enterprise units and other financial Or the lighting engineering field invested by state-owned capital will use LED lighting.
The author agrees that LED is a high-quality light source, but the quality of the light source has to be seen where it is used. So far, the author dare not say that the street lamp is very mature. It can only be said that there is a street lamp in the way of traditional street lamps. In fact, there is still a long way to go before popularizing LED street lamps.
The night scene of LED streetlights taken with a camera may be much better than the night scenes of street lights using high-pressure sodium lamps. The measured light intensity may be close to or meet the current standard light intensity. LED lamps are really much better than high-pressure sodium lamps in terms of data performance, but how many people pay attention to the biological indicators of human eye comfort?
LED lamp as a street light source, the author also thinks it can, but the current street lamp standard and installation method must be changed, following the installation method and standard measurement of high-pressure sodium lamp, it is not suitable on LED street lamp.
The LED light source is a high-intensity light source compared to a high-pressure sodium lamp, and can basically be regarded as a full-spectrum light source. Traffic roads are highly polluted environments, with complex and diverse pollutants, dust, automobile exhaust, road waste and so on. The light absorption ratio of the pollutants to the various color components in the streetlight illumination spectrum is different, the light of one or several colors may be completely absorbed, and the ratio of the remaining light of other colors is not high in the whole spectrum, so the person The amount of light received by the eye is small, and the bright light source that is received (seen) by the human eye forms a strong difference in light intensity, making it almost "look" at that portion of the reflected light.
On the other hand, the LED is essentially a light source with a spectral defect. At present, the blue light chip excites the white light "made" by the phosphor, which is insufficient in the light component of the most sensitive band (555 nm) of the human eye.
There are many reasons why the current LED light source application is not suitable for road lighting, and it should be improved a lot.
Some people may ask, why are the LED streetlight detection and test data and lighting effects better than the existing high-pressure sodium lamps?
First analyze the test and test conditions. At present, most of them choose to test LED street lights when there are fewer vehicles in the evening and less pollution. Therefore, the measurement results displayed by the instrument may be more beautiful than those of high pressure sodium lamps. Of course, the detection of the instrument is a mechanical test. The detected data is concentrated on the light intensity and the light distribution curve, and the reflected light of the illuminated object can be felt by the human eye. The detection, especially the detection of the reflected light intensity of an object, is still a blank, and the detection has certain difficulty.
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