CREE lighting class XT series LED and road lighting reference program

CREE through persistent innovation to promote the popularization and application of LED lighting, the practice of CREE's mission, leading LED lighting revolution, eliminate inefficient lighting, to accelerate the realization of the wide application of LED lighting. CREE LED lighting class leading technology, to help achieve the road lighting energy-saving effect significantly, and completely in the light efficiency, brightness, illumination, heat and life to reach the national standard of road lighting, faster returns on investment, and intellectual property rights and brand advantages for customers to help our customers to escort, leading market position. Leading technology will better promote the market leader, thereby helping companies in the LED lighting change to get more robust development.

According to the LED lighting field, CREE has launched XM series, XP series, XT series, XB series, CXA series of different price level LED lighting products, fully meet customer product design requirements for different market positioning, to help customers achieve lower system cost and higher performance of lighting products and solutions. This article will share CREE lighting class XT LED and road lighting reference program, while CREE look forward to the future with the industry counterparts to carry out more technical exchanges.

CREE XLamp XT series LED SC fand technology platform innovative based on the use of a new generation of silicon carbide (DA Direct Attach) chip. The optimal heat dissipation package and new phosphors, reliability of luminous flux and light effect and better, with high light output, high reliability and high efficiency characteristics. XLamp XT-E LED has two times the cost of other LED products (lm/$), as well as the industry's highest performance and light efficiency, the fundamental obstacle to eliminate the biggest obstacle to large-scale application of LED lighting. XLamp XT-E LED uses a conventional 3.45mm x XP 3.45mm package structure that can be applied to almost all lighting applications. Based on the XP packaging structure, customers can easily XLamp XT-E LED and existing XLamp XP LED design program, which can shorten the design cycle of LED lamps and accelerate the speed of product launch.

Generally speaking, outdoor lighting requirements of high efficiency, high maintenance, Gao Guangtong characteristic, also the relative indoor lighting security needs more and better performance is required in life and reliability. The light effect, light, excellent light color quality, life and reliability is the advantage of CREE XLamp series of products. For all kinds of lighting products on the market, the actual case of high efficiency products XLamp XT-E devices in some module and client application application of street lamp, share and discuss together with lighting manufacturers or designers and other colleagues in the industry.

XLamp XT series is CREE's excellent LED, according to the requirements of a single larger power or low color temperature, we have produced a different color temperature, different light efficiency requirements of the program. Based on good performance, life and color coordinate stability, as well as high cost performance and other factors, the design were selected 3000K/4000K/5000K color temperature, Q5/R3/R4 file.

Figure 1 XLamp XT-E LED brightness and color temperature selection

XLamp XT-E LED has been tested by LM-80, in line with the requirements of the energy star, which provides a good foundation for safe and reliable street lamp design. XLamp XT-E LED is a CREE company with intellectual property led, in line with the various countries of the world's patent requirements, can enter any one country for sale.

Figure 2 XLamp XT-E LED profile and pad

Because the LED light efficiency increase, heating proportion continues to decrease, but also input 60~70% power is converted into heat and the rest into the light, so the need for a cooling system to ensure the lamp long-term reliable operation, so we choose the following parts to help LED cooling.

Figure 3 high thermal conductivity MCPCB

Fig. 4 heat dissipation structure

Figure 5 solder joint temperature test

Through the physical test, the reference design of the solder joint temperature of about 46.4 degrees, calculated by Tj about 55 degrees.

In the aspect of optics, the scheme of integrated lens is used to support the design of street lamp module. The optical efficiency can reach more than 93% by using Reddick street lamp lens (LL14CR-AOC65150L02).

Figure 6 street lamp lens

Through the combination of 6 parts such as heat dissipation and optics, we have made a series of street lamp modules including LED, aluminum substrate, radiator, optical lens, waterproof and so on.

Figure 7 street lamp module

Figure 8 street lamp module and light distribution curve

The measured data are as follows:

Table 1 XLamp LED XT-E module data measured

The test results showed that the three XLamp XT-E LED streetlight module design scheme of light efficiency can reach 85 lm/W, the R4 file can be more than 100 lm/W, the modular design which has the advantages of simple structure, easy assembly, and can meet the needs of different color temperature, light efficiency requirements of high-quality lamp design.