Neutral white LED with cold white LED differences in street lighting applications

In this paper will introduce the street lighting applications use neutral white LED to replace the benefits of cold white LED, including liquid visibility streets, skin and flower color performance, etc. In addition, this article will discuss the solution of the temperature and optical design method, such as forced ventilation method, and the size of the dazzle light and brightness, etc. Because the LED technology has small volume and the advantages of the diversity, so you can easily implement new street lamp design.

based on a tight budget, using LED lighting can be less of the innovation of the maintenance cycle and save electricity dimming technology to save electricity.

in the last few years, after the evolution of technology, the LED on the photometric output, the luminous efficiency and service life has improved, so for a variety of other light source used in the past the application is more and more attractive, especially the street light is now can use the application of LED technology to solve.

based on the LED street lamp first appeared in a few years ago in the street, although they are mainly used in display design concept or campus test lamp. Yellow phosphor is the only available at the time, stable, used to match one of the phosphor powder blue chips to produce white light output. Most of these lamps is designed with cold white LED, about 6000 k color temperature is even higher. Unfortunately, most people don't like cold white light from the street lamp line, some even complain cold white light will bring the feeling of cold. In addition, there are those who think the color under the irradiation of cold white illuminant pale.

LED and fluorescent powder manufacturers heard for the first generation of prototype set of feedback, and began to street lighting applications developed for a more natural, a new type of neutral Bai Guanggao 4000 k color temperature LED brightness output. For example, Mr Anwar technology ( Avago) The ASMT - JN32 - NVV01 can to provide 100 lm 350 ma current or lm 160 700 ma current minimum typical correlated color temperature (4000 k 有条件现金转移支付) The photometric output.

　　LM- 80 LED the life test for the LED light source standard must have at least 35000 hours of life, a new high power LED under high junction temperature can reach 60000 hours (the least L70, B10) 。 With an average of 12 hours a day, About 4400 hours a year) The use of time, using the latest LED technology of street lamp can easily achieve 10 years life and do not need to change the light.

from the point of view of product packaging, modern LED encapsulation with (6 ~ 9 ℃ / W K / W) Low thermal resistance. This will help as much as possible the heat from the node to the radiator. In addition, the photometric output under different junction temperature is very stable, 25 ℃ to 110 ℃ / junction temperature changes within the scope of less than 20%.

another the benefits of using neutral high-power white light LED phosphors is that it USES the advanced technology, can bring a better spectral distribution. Compared with cold white LED, neutral white LED light is more yellow and red wavelength ( See figure 2) 。 The spectral distribution helps to distinguish different liquid asphalt road surface. Cold can make white LED is basically on the streets of oil, water or cherry juice is very difficult to distinguish - — If you are driving, can distinguish the oil stains on the ground will be very helpful! Neutral white illuminant, on the other hand, can make the brown oily be soiled or red cherry juice is very easy to distinguish.

in addition, in the neutral white LED light skin color is more natural. Street house color flower beds and green grass will look more attractive and feel warm. Community security and personal security will be improved because of the brighter lights. Global statistics, points out that under the good street lighting, theft and car theft case will be greatly reduced.

the use of the LED is very simple and widely used, can bring a lot of new and fascinating street lamp design, such as ultra-thin design and rectangular or square lamp shell, etc. Designers and engineers have to consider all design oriented ( Including temperature, optical, and electrical, etc. ) To achieve a successful commercial street light projects.

edit: Steve