CREE Cree Lighting XT Series LED and Road Lighting Reference Solution
With the wide application of LED lighting, for the field of LED road lighting, Cree currently introduces XM series, XP series, XT series, XB series, CXA series and other cost-effective lighting-level LED products, fully satisfying customers' positioning for different markets. Product design needs to help customers achieve lower system cost and higher lighting performance products and solutions. This article will share Cree's lighting-class XT series LED and road lighting reference solutions, while Cree looks forward to more technical exchanges with industry peers in the future.
CREE Career promotes the popularization and application of LED lighting through persevering innovation, and implements the mission of Cree, leading the LED lighting revolution, eliminating low-energy lighting, and fully accelerating the wide application of LED lighting. Cree's LED-leading technology helps to achieve significant energy-saving effects on road lighting, and fully meets national road lighting standards in terms of light efficiency, brightness, illumination, heat dissipation, and longevity, achieving faster return on investment, and brand and knowledge. The property rights advantage protects customers and helps customers lead the market. Technology leadership will better promote market leadership and help companies achieve stronger growth in LED lighting revolution.
Cree XLamp ® XT Series LEDs are based on the revolutionary SC ® technology platform, featuring next-generation silicon carbide DA (Direct Attach) chips, optimized heat dissipation packages and new phosphors for higher luminous flux and efficacy and better reliability Combines high light output, high reliability and high light efficiency. XLamp ® XT-E LEDs offer twice the price/performance ratio (lm/$) of other LED products and the industry's highest performance and efficacy, virtually eliminating the biggest barrier to large-scale LED lighting applications. Available in a conventional 3.45mm x 3.45mm XP package, the XLamp ® XT-E LED can be used in almost any lighting application. Based on the XP package structure, customers can easily combine XLamp ® XT-E LEDs with existing XLamp ® XP LED designs to shorten LED luminaire design cycles and speed time-to-market.
Generally speaking, outdoor lighting requires high luminous efficiency, high luminous flux, high maintenance characteristics, etc. In addition, it requires more safety protection than indoor lighting, and requires better performance in terms of life and reliability. Light efficiency, optical communication, excellent light color quality, longevity and reliability are the advantages of the Cree XLamp ® series. For the various street lighting products on the market, the high-efficiency series XLamp ® XT-E devices are shared and discussed with the lighting manufacturers or designers in the actual case of some module solutions and customer applications in street lighting applications.
XLamp ® XT series is a fine LED of Cree. According to some requirements of single power or low color temperature, we have made different color temperature and different light efficiency requirements. Based on good performance, longevity and color coordinate stability, as well as high cost performance and other factors, this design uses 3000K/4000K/5000K color temperature, Q5/R3/R4 file.
Figure 1. XLamp ® XT-E LED brightness and color temperature selection
XLamp ® XT-E LEDs have been tested with the LM-80 to meet ENERGY STAR requirements, which provide a good foundation for safe and reliable street lighting design. XLamp ® XT-E LEDs are Cree's intellectual property LEDs, which comply with the patent regulations of various countries in the world and can be sold in any country.
Figure 2. XLamp ® XT-E LED outline and its footprint
Due to the improvement of the luminous efficacy of LED lamps, the proportion of heat is decreasing, but 60~70% of the input energy is converted into heat, and the rest is converted into light. Therefore, a heat dissipation system is needed to ensure long-term reliable operation of the lamps, so we choose the following accessories. To help LED heat dissipation.
Figure 3. High thermal conductivity MCPCB
Figure 4. Heat sink structure
Figure 5. Solder joint temperature test
Through the physical test, the solder joint temperature of this reference design is about 46.4 degrees, and the calculated Tj is about 55 degrees.
In terms of optics, we use an integrated lens solution to complement our street light module design. With Redick street light lens (LL14CR-AOC65150L02), the optical efficiency can reach more than 93%.
Figure 6. Street light lens
Through the combination of six components such as heat dissipation and optics, we have made street lamp modules including LED devices, aluminum substrates, heat sinks, optical lenses, and waterproof parts.
Figure 7. Street light module
Figure 8. Street light module and light distribution curve
The measured data is as follows:
Table 1. Measured data for XLamp ® XT-E LED street light module
The test results show that the three XLamp ® XT-E LED street light module design solutions can achieve 85 lm / W, R4 can exceed 100 lm / W, modular design makes the structure simple, easy to assemble, can High-quality street lamp design that meets different color temperature and light efficiency requirements.
Lithium-boron Alloy is a composite material composed of a brittle Li7B6 matrix phase with a porous structure and a ductile Li filling phase. The density is 0.88±0.04g/cm3. The appearance is silver-white metal. It is extremely unstable. It is easily deteriorated when exposed to air and reacts with water. severe. Lithium-boron alloy is mainly used as anode material for lithium-based thermal batteries. It has outstanding advantages such as high specific energy, high specific power and low polarization, electrochemical potential similar to that of pure lithium, and solid state above 600℃. It is a new type of lithium-based thermal battery. The excellent negative electrode material. Compared with the currently widely used lithium-silicon alloy, the unit cell assembled with the lithium-boron alloy as the negative electrode material has better performance in both the highest voltage and the discharge working time.
Shandong Huachuang Times Optoelectronics Technology Co., Ltd. , https://www.dadncell.com