Key indicators of high-power LED street lighting
2015/01/05
LED With its green, high efficiency, long life and other characteristics, much attention, especially after the successful development of high-power LED light source, urban street lighting energy saving possible. Resulting in a larger application promotion difficult.City lights energy-saving, the necessity and importance of environmental protection
1, the state to promote green lighting, implementing the requirements of environmental protection;
2, to ease the tension in sustainable energy requirements;
3, minimize maintenance costs and ease the financial strain street conservation requirements;
4, reducing lighting design is too bright, glare ask too much;
5, the voltage peak of the rugged requirements.
Several problems existing street lighting
1, the center of illumination is too high, and the uniformity is not enough. Designers only emphasized the light, resulting in waste of energy, especially now that the conditions off more and more stores, illumination is not necessary to be too high.
2, choose only from sources considered lumens, with little regard for people's physical characteristics. For example: Daylight Twilight hypnotic effect, and the excitement of the morning daylight makes the role.
3, in the case of ambient darkness made lively mutations how to configure the street.
4, to prevent light pollution requirements of the standard low.
Using high-power LED street light is used as the advantages
However, as a new source of city street lighting project, LED Compared with traditional lights, the biggest advantage is that the energy-efficient, environmentally friendly, which makes the situation in the power shortage, the transformation of urban street lighting lighting project possible. from the point of view of energy-saving effect of 3 × 20W total power supply even street at about 75W (power efficiency is calculated as 80%). It is on the ground and according to the scope and illumination with 150W sodium equivalent 150W sodium and even power, including the power consumption is about 175W, saving more than 50% roughly.
About the price, we have to calculate the overall cost, this area has a lot of reports, from our marketing experience, is not a prohibitive price. LED lights are a new thing, and now many customers with traditional street light standards and requirements of LED lights many have suggested, there may be some bias. Our advice is to emphasize uniformity and reduce average. It seems a bit unfair. Due to economic development. Monument road lighting standards have become obsolete, especially considering the lack of human factors. The proposed combination of features of the new light source, the revised standard.
High-power LED street lighting solutions of
(1) the total flux shortage.
On the road illumination and brightness required. To meet this requirement to have a considerable light flux.
If we can solve this problem in the following two ways:
One way: the use of chip packaging technology, made of a single high power LED, currently has 30W,
40W products, light efficiency 45- - 50Lm / W, if we can 2---3 combinations, the total power can be increased to
100W, total luminous flux of 5000 lumens.
Two ways: improve the efficiency, ie the number of lumens per watt, currently 45- - 50Lm / W, there is hope in the near future to mention
High-to-50- - 70Lm / W
(2) Light color question:
As mentioned earlier, sodium is not a good light, much better than the sodium metal halide, to achieve the same
Like brightness, metal halide flux can be reduced, as shown in Figure spectrum metal halide. We let
LED spectrum from the usual metal halide into a closer, to improve light color. Figure II is a common core plus LED light
YAG phosphor obtained white LED spectrum.
Figure 3 shows the spectrum after the change.
Problem (3) the light fades and stability, LED light failure is exponentially decaying, start very fast, by 400 - after 600 hours plainness. Below is an actual curve 30WLED bad light. It depends LED working temperature of us to inform the design radiator and lamp integrated structure, so that this problem is resolved.
(4) we present some of the test data in terms of high-power LED lights as follows: Uniformity
≥0.3, using cross street configuration, spacing 25---30 meters. (A 10W LED light source with no penetration
Mirror).
According to the development trend of innovation Hugh power semiconductor lighting and related technologies, and we proved that, with the high-power LED light efficiency continues to improve and optimize the design and structure of the cooling material handling and secondary optics, LED use on the road
Lighting is entirely possible, and just around the corner for urban high-power LED street reconstruction project, as well as extensive promotion of new roads is bound to provide a powerful solution for urban street energy saving, environmental protection.
In order to reflect the performance advantages of LED, we believe that the key lies in the following indicators aspects.
1, street overall energy index
2, the parameter index physiological factors should be considered in light of people
3, light intensity and brightness index
4, light pollution index
5, the service life indicator
6, in addition to other clean energy mains (such as solar, wind, etc.) indicators for street lighting
7, reliability, security, stability index
