How to evaluate the lighting quality and energy saving effect of LED street lamps

LED street light is essentially a road lighting product

Wu Chunhai said that LED street lights are essentially road lighting products. The overall lighting effect of LED street lights is over 80lm/w. The application space has been opened. Energy saving is a natural thing. Energy saving is no longer the most important consideration. LED street lights should pursue a more essential meaning and return to the ultimate positioning of their road lighting products. Wu Chunhai believes that low-carbon energy conservation is important, and the quality of lighting is more worthy of attention. The energy-saving effect of LED street lights is only meaningful if the lighting quality is achieved. LED street lights must strike a balance between lighting quality and energy efficiency.

How to evaluate the lighting quality and energy saving effect of LED street lamps

The evaluation of the lighting quality and energy saving effect of LED street lamps is mainly based on the current road lighting design standard CJJ45-2006, including average illuminance, illuminance uniformity, brightness longitudinal uniformity, glare, environmental ratio, power density and other indicators. Focus on the lighting effect of the entire road. There is also the LED street lamp's own indicators, including light efficiency, light distribution, color temperature, color rendering index, light decay, life, input power, etc., but the performance and quality of the street lamp itself, there is a difference between the two. Through these two basics, the lighting quality and energy saving effect of LED street lamps can be evaluated.

According to the LED street lamp test data from March 2009 to present in Shenzhen, the road lighting design standard and the relevant indicators of the LED street lamp itself are combined to analyze the results. In 2009, the overall lighting effect of mainstream LED street lamps is about 50-80lm/w. In 2010, the mainstream level averaged about 70-90 lm/w. Combined with the data, it has been able to meet all levels of road lighting needs.

According to the design criteria, comprehensively consider the illuminance, power density, maintenance factor and other indicators, and combine the empirical values â€‹â€‹obtained from the actual situation of the Shenzhen road. The mainstream LED road lighting effect has been more than 250w sodium lamp, the index is higher than the 400w sodium lamp, and the application on the road with two-way 6 lanes or less has matured. On a narrow road, through reasonable design, the power saving rate can reach more than 50%.

Lighting priority, energy saving

Combined with the test results of Shenzhen in recent years, domestic LED street lamps are not inferior to international brands in terms of light efficiency and light decay, but there is a big gap between light distribution (brightness index) and light color (color temperature uniformity). . Wu Chunhai believes that as technology becomes more mature and more widely used, these shortcomings also make the promotion resistance more and more. LED street lights are promoted due to the obvious energy-saving effect, and may also stop due to poor lighting quality. Only by achieving good lighting effects can we win the support of users and promote scale application. Therefore, the lighting quality and energy-saving effect are the two wings of the LED street lamp soaring, and it is necessary to balance the two. Lighting priority, energy efficiency should be the current application focus.

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