energy-saving effect on the LED lights, LED light lamp to replace
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by: lindazbn
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Date: Thu, 10 Nov 2011 Time: 2:21 AM
In recent years, the rapid development of domestic LED lighting applications, many manufacturers have introduced high-power LED street lamp, and as more and more energy-efficient products used in road lighting, in the current high-power LED street lamp can really replace the traditional light sources (mainly high pressure sodium) yet? Following high-power LED street lamp, I applied on to talk about views:
First, the energy-saving effect on the LED lights, LED light lamp to replace, in many practical cases of high-pressure sodium lamp, the saving is an important factor, but not better than the actual high pressure sodium lamps LED power-saving. From the luminous efficiency, the existing high-power LED street lamp practical light-emitting efficiency (80lm / W) well below the high-pressure sodium lamp (100 ~ 138lm / W), although the LED is a directional light, more efficient than high pressure sodium lamps, but the end of luminous efficiency, LED street light lamps integrated energy efficiency or lower than the high-pressure sodium lamp.
In some LED lights to replace high pressure sodium lamp that was the case of energy-saving effect, according to analysis, these cases are often the original high-power lights (brightness far exceeded) or low efficiency lamps, light a serious state of decay, as a LED lamp section power is not based on science.
2, LED street lamp light color problem, the current high-power LED street lamp which is basically 5000K ~ 6000K color temperature of white light, as road lighting, the visual feel too cold, while hyperopic eyes of observation time will decline, in this regard Some studies show that less than 3000K of yellow or warm white light is more suitable for road lighting, so color LED solar street lamp is not suitable for street light utility.
3, LED street lamp costs are far in the current high pressure sodium lamp, a LED lamp current price of 4,000 yuan to 8,000 yuan, or more, a high-pressure sodium lamp imported brands (including lamps, complete sets of electric light) price is not more than 1500 yuan The average price is less than a quarter of LED lights.
Fourth, more life, LED street lamp is 50,000 hours nominal life over, this is the ideal life of the chip, chip packaging, heat lamps may light attenuation and other factors, as well as drive circuit (mainly electronic components) Obviously they can not achieve the life of 50,000 hours. Once part of the LED lights in the trial, it found that less than half a month, the attenuation of light have been very obvious.
High pressure sodium lamp lifetimes are now more than 28,000 hours, the practical application of 3 to 4 years not a big problem, compared to high pressure sodium and supporting the life of electrical appliances and more to the problem.
Maintenance of the light source, high pressure sodium lamp to more easily be replaced in the field directly to electrical light source, and lower cost. For LED lamps, I think, that is maintenance-free factory, so the on-site maintenance can not be carried out.
5, LED street lamp light distribution problem is the LED street lamp with optical technology has made significant progress, some manufacturers have developed a system of secondary distribution of light instead of relying solely on-chip array to go with light, but the broad view, light distribution can not be entirely reasonable, I have observed a lamp, with the road side is brighter, uniformity also meet the requirements, but significantly less than the sidewalk side of brightness, SR value is clearly not meet the requirements.
Currently developed a grading system of secondary products is not much choice in the application of good LED lights much.
6, LED lights a lack of uniformity in product specifications technical standards, there are no unified standards for LED street lamp production technology, by their own standards for each manufacturer to produce their own products, it is difficult common among the other multi-chip LED lamp assembly features to bundle chips and lamps, difficult to maintain, maintenance must use original product.
The high-pressure sodium lamp because of technical harmonization of standards, lamps, lighting, electrical aspects of universal strong products between different manufacturers is interoperable, from maintenance point of view, it is very important, but maintaining it for the street light management unit in turn is the most important, and only then can it be lights out timely maintenance to ensure a high lighting rate (the higher authorities of the street management and evaluation of the most important content), while significantly reducing maintenance costs.
Can be said that the current state of development, LED lamps can not be maintained, the event of a failure, only the replacement of lamps, in addition to high costs, but also greatly extended the time to maintain, this unit is very much on the use of unfavorable.
LED lighting is a developing technology, its luminous efficiency is constantly improved, costs have been declining, but to replace the traditional high pressure sodium street lighting is not as often, so issued by the Ministry of Construction, “” Eleventh Five “city of green Lighting Project Plan “, the city road lighting professional committee” implementation of the “Eleventh Five-Year” Plan Town Green Lighting Project Implementation Rules “and other policy documents in a clear energy-saving lamps or high pressure sodium lamp based light sources, LED lighting is recommended in the Urban Landscape application.
