In recent years, with the deepening of research on semiconductor luminescent materials, the continuous improvement of high-power LED manufacturing processes and the development and application of new materials (nitride crystals and phosphors), ultra-high brightness and high-power LEDs of various colors have made breakthroughs. Sexual progress, its luminous efficiency has been rapidly improved, and all colors in the visible light band have been achieved in terms of chromaticity. The most important one is the emergence of ultra-high brightness and high-power LEDs, making high-power LED applications span the high-efficiency lighting source market. may. High-power LED lighting is about to lead the leap-forward revolution of the fourth generation of light sources in the future.
First, the performance characteristics of high-power LED used as the light source of the lamp
1. High luminous efficiency: After several decades of development of high-power LED, the luminous efficiency has been greatly improved. Incandescent lamps, halogen tungsten lamps have a luminous efficiency of 12-24 lumens/watt, fluorescent lamps 50-70 lumens/watt, and sodium lamps 90-140 lumens/watt. Most of the power consumption becomes heat loss. The light efficiency of high-power LEDs can be improved to 50-200 lumens/watt, and the light has good monochromaticity and narrow spectrum, and can directly emit colored visible light without filtering.
2, low power consumption, energy saving: high power LED small current drive, low voltage work. In the case of the same lighting effect, the power consumption is one tenth of that of an incandescent light bulb, and one half of a fluorescent tube.
3. Long service life: The lamps with high-power LED light source are small in size and light in weight. High-power LED light source epoxy resin package, can withstand high-strength mechanical shock and vibration, not easy to break. The average life expectancy is 100,000 hours. The service life of high-power LED lamps can reach 5 to 10 years, which can greatly reduce the maintenance cost of lamps and avoid the pain of frequent lamp replacement.
4, safety and environmental protection: low heat, no heat radiation, low voltage work, cold light source, can be used for some special occasions; no harmful metal mercury, no infrared and ultraviolet radiation.
5. Small volume and power, flexible design: Different types of high-power LED combinations can be used to design lamps with different structural shapes according to different usage environments.
6. Light distribution is easy: light color is soft, no glare; different wavelengths produce different colored light, bright and saturated, no filter is needed, can make different color temperature colors in high-power LED package to achieve the actual required lighting effect.
The high-pressure sodium lamp currently used has a yellow color, and the color temperature and development index are relatively low. The solar light imaging index is 100, while the high-pressure sodium lamp has a development index of only about 20 (yellow light); the color temperature of high-power LED light source illumination can be flexibly selected between 4000-7000K, and the imaging index can reach 80 or more. The illuminating color of the luminaire is closer to natural light.
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