Analysis on characteristics of LED city lighting street lamps

Although many enterprises in our country have developed and produced LED city lighting street lamps, many of them use low-power LED arrays as illuminators, thus solving the problem of heat dissipation. The number of LEDs used is large, and the light attenuation of low-power LED is strong. the installation cost is high. It is a development trend to adopt high-power LED for City Lighting LED street lamps. A few street lamp products that use high-power LED as luminous bodies do not solve the heat dissipation problem of LED when the power reaches a certain amount. LED astigmatism and spotlight control problems, street lamps on the road surface illumination range, type and illumination balance problems, photoelectric conversion efficiency is too low, product performance is not satisfactory. The price of high-performance products remains high and it is difficult to popularize. Heat dissipation and reliability are the main factors affecting LED application. When LED device products are applied to street lamps, the special technical requirements are mainly to combine LED light intensity and luminous angle to design. In addition, due to the combination of multiple LEDs, light design should take into account the irradiation area, and lamps should focus on the effectiveness of heat dissipation. Compared with ordinary street lamps, LED street lamps have the following advantages: energy saving, environmental protection, easy to adapt to low voltage, and can also be directly matched with solar energy system without additional inverter and conversion process. can achieve large energy efficiency. The use of LED street lamps also has certain deficiencies, such as small and uneven lighting angle, low color rendering index, and complicated optical and heat dissipation designs. In addition, the luminous flux under the current technology is not enough, the luminous efficiency is too low, and the quality is difficult to guarantee. Therefore, the application of LED products to street lamps requires special design and special standards ( It is often not objective to evaluate LED light sources with test data of traditional light sources). LED has inherent advantages and disadvantages when applied to street lamps. The advantage is: LED as a point light source, if the design is reasonable, it can directly solve the problem of secondary light extraction and light loss that the traditional spherical light source must rely on light emission to solve to a large extent; Second, the uniformity of the light irradiation surface can be controlled. Theoretically, it can be completely uniform in the target area, which can also avoid the waste of light in the phenomenon of lighting under the traditional light source; Third, color temperature is optional, which is also an important way to improve efficiency and reduce cost in different applications. Fourth, there is still much room for technological progress. Disadvantage (Factors affecting the promotion and application of street lamps) : The current price is still too high and the luminous flux is low. The current price of LED light sources with the same illuminance design is about 4 times that of traditional light sources ( However, in street lamp products, the light source part does not account for the total cost, so the cost increase ratio in engineering installation will not be too high, and the application space is still relatively large)It is unbearable for civilian use. The current design and manufacturing standards are chaotic and the damage ratio is high, which affects the life of LED.