In recent years, with the evolution of technology, LED luminous efficiency and service life of the photometric output, has been significantly improved, so for the majority of applications are used various other sources more attractive, especially the street is currently can be used to solve the use of LED technology.
Street lamps based on LED first appeared in the streets a few years ago, although they were mainly used to display design concepts or campus test lights. Yellow phosphor was the only one that can be used and stabilized at the time to match the blue chip to produce white light output. Most of these lights are using cold white LED design, color temperature is even higher in 6000K. Unfortunately, most people don't like the cold white light from the street lamps, and some even complain about the cold white light. In addition, there are people who feel that the color of the cold white light source under the pale.
LED and fluorescent powder manufacturers to hear feedback on the first generation prototype set, and began to develop a new application for street lighting neutral white high brightness output LED, 4000K use more natural color. For example, Annwa (Avago) 4000K ASMT-JN32-NVV01 minimum typical temperature can provide 100lm or 700mA current to 350mA current 160lm (CCT) photometric output.
LED LM-80 life test suggested that the standard LED light source must have a minimum of 35000 hours of life, a new high power LED at high junction temperature can be achieved at least 60000 hours (L70, B10). With an average of 12 hours per day (about 4400 hours a year), the use of the latest LED technology can easily reach 10 years of life without the need to replace the light source.
From the point of view of the product package, the modern LED package has a low thermal resistance of 6~9 C /W (K/W). This helps to transfer heat from the node to the sink as much as possible. In addition, different junction temperature of the photometric output is also very stable, 25 C / C to 110 C / junction temperature range of less than 20%.
Another advantage of using neutral white power LED is that it uses advanced phosphor technology, which can lead to better spectral distribution. Compared with the cold white LED, the light emitted by the neutral white light LED has more yellow and red wavelengths (see Figure 2). Such spectral distribution helps to distinguish the different liquid on the surface of asphalt pavement. Cold white LED basically makes the oil, water or cherry juice on the street very difficult to distinguish if you are driving, can identify the ground oil will be very helpful! On the other hand, the neutral white light source can make brown grease or red cherry juice is very easy to distinguish.
In addition, the skin tone of the neutral white LED light source is more natural. Color Garden Street homes and green grass will look more appealing and feel the warmth of love. Community security and personal safety will be improved because of the more bright lights. The global statistics pointed out that in better street lighting, car theft and theft will be greatly reduced.
The use of LED is very simple and widely used, can bring many new and fascinating street design, such as ultra-thin design and rectangular or square lamp etc.. Designers and engineers must consider all design oriented (including temperature, optical, electrical, etc.) to complete the successful commercial street lighting project.
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