Released recently by "Shanghai's ' Twelve-Five ' Semiconductor Lighting industry development plan (approved release)" revealed that, in accordance with the six ministries jointly issued, "Twelve-Five" period, functional lighting LED market share to reach 20%. According to this projection, Shanghai present 400,000 streetlights, there will be 80,000 needed reconstruction LED lamp.
This plan has just introduced leads industry debate: advantages of LED lamps are energy-saving, long life, good color, but there are also some views consider that, LED street lighting technology is not perfect, may make some drivers feel does not fit, or even produce visual fatigue. In this regard, illumination optics, experts say if the photometric technology has done well, LED street lamps can avoid these problems, ask the bus driver to feel more comfortable.
Illumination optics expert, engineering manager of Shanghai semiconductor lighting engineering technology research center said Yang Jiexiang, compared with the traditional street light, LED street lamps with excellent energy-saving characteristics. Street lamps now general use can be divided into 250 Watts power, 400 w and 1000 w third gear. 250 Watt lamps, for example, actually hits the pavement on the luminous flux of approximately 14,000 lumens, but the brightness of a 150-watt LED lamp can reach. At the same time, traditional street light is difficult to achieve dimming feature, it is easy to reduce lamp life, LED lamps do not have this concern. In addition, LED street lamps in the restore object color effects is also good in terms of color, sunlight restore objects have colors work best. In fine weather, the midday sun color if you count 100,LED Street lamp's color rendering you can reach 70 per cent, while only 20 to 40 HPS.
At present, Shanghai LED Street lamp is only 2% per cent of the total, about six thousand or seven thousand, only tolled section of the Yangtze River in the use of LED street lamps. Yang Jiexiang, to accomplish this goal, hope that Shanghai authorities actively promoting the reconstruction of old road in the next 5 years, some also hope that the direct installation into new street lamps LED lamps.
LED Street lamp remaining flaws
Drivers driving years old Yao You nearly 20 years experience. A few days ago he set was shipped on LED street lights in the canton of slip roads. Car just turns into a wide branch, overall color of the pavement has changed. "Street light is yellow, the road how white light of street lamps? "Laoyao tightly to the wheel, and even stepped on two foot brake, speed of 40 km/h down to 30 km.
-Canton branch only more than 200 meters long, equipped full length of the crossing with 7 sets of LED street lamps. At the same time, road within the community have also been installed at the end of several LED lights, these street lamp shade inside the 4 row LED light bulb.
Laoyao said that in addition to the lighting colors, brightness of the lights are not comfortable with him. "Clearly felt, was direct sunlight to the pavement by street lamps is very bright, very clearly, but the two street lamps between the road surface is very dark. If someone suddenly from the dark came out, I may be too late to brake. "In order to prove this point, tongxin road is a small road, but normal street light Trek. "This road although the light color of a softer, more uniform brightness of the road. "Laoyao pointed to the ground between two street lamps says," I can see clearly, much more comfortable. "In this way, old Yao drive has always been maintained at about 40 kilometers per hour.
However, there are some drivers not so sensitive. Lived in nearby communities of Miss Liu is almost every day driving through broad branch, Miss LAU has no sense of home lighting at the entrance does not in General. "Others don't say I haven't found yet! "Miss LAU said, the car's windshield founder well put up a gradient of films, just fail to glare. And another with more than 10 years of driving age of taxi drivers also said that this road is so short, hasn't felt uncomfortable to open out.
To solve the problem of technology has
For old problems encountered by Yao, Yang Jiexiang is aware of the: "the most worrying is, LED street lamps when I first started using, the pilot may be accustomed to traditional street lamps light lights are not used, resulting in uncomfortable driving environment. ”
According to Yang Jiexiang analysis, the driver said "not used" is mainly derived from color. High pressure sodium lights yellow, LED street lights are white, but drivers can soon get used to it. The other hand, the LED lights can also adjust the color, if necessary, LED street lamps change to yellow is not difficult. As for LED light source glare, "Zebra effect" and other issues, Yang Jiexiang concede that some products do so. "It depends on the quality of their products. Photometric technology good LED street lamps can improve it. Currently some manufacturers introduced the warm white LED street lamps, color closer to high pressure sodium, "said Yang Jiexiang, Shanghai in the promotion of LED lamps photometric technology should be used well in the process. He said, now there are some LED street lamps photometric technology does a pretty good job, such as Shenzhen using LED lights on the highway, has basically been eliminated "the Zebra effect".
[Noun explanation]--the Zebra effect
According to Yuan Qiao, an associate professor of environmental science and Engineering Department of Fudan University briefing, LED street lamps just below may be very bright, but pavement dimmer between two street lamps, this is what LED street light "the Zebra effect". This behavior occurs because the LED light source direction is so strong that in this road a long time, easy to produce visual fatigue for some drivers, resulting in slow down reaction.
