Status analysis of luminosity data of LED road lighting fixtures (sequel)

This paper conducts a continuous statistical analysis of the optical performance quality of 100 LED street lamps in the second half of 2009, which is a sequel to the “Analysis of the Status of Photometric Data for LED Road Lighting” in the mid-2009. These data are the basis for evaluating the current status and development of LED road lighting performance quality.

I hope that we can look at the existing level of LED street lamps from a development perspective, provide some relevant information for improving and improving the quality of LED street lamps in China, and provide objective reference data for the planning of road infrastructure management departments at all levels. A summary of statistical work has shown that continuous data summarization of LED street lights is essential. From the appearance of LED street lamps for only 3 years, although LED street lamps have made great progress in all aspects, LED street lamps should be tested for a longer time than half a century of high-pressure sodium lamps and metal halide lamps. Continuous improvement of quality can be gradually recognized by the lighting industry. The data categorization method in this paper still uses ENERGY STAR qualified criteria for SSL luminaires published by the US Department of Energy (DOE).

The analysis in this paper deals with the photometric performance of LED street lamps, including the light output of the luminaire, the longitudinal light distribution along the road, the lateral light distribution along the road, the symmetry of the light distribution at C-90° and C-270°, the uniformity of the beam and The level of cut-off, while also analyzing the energy efficiency of the luminaire. This article does not address the chromaticity performance and light output maintenance of LED street lights.

The data in this paper comes from the photometric data of 200 cantilever LED road lighting fixtures with a power of 50W-200W, motor vehicle lanes, and pole heights of 8m and above measured between 2007 and the end of 2009. The power distribution involved is shown in Figure 1. Figure 1 divides the power of the LED Street Light from high to low into four gears. The proportion of lamps other than 100W to 150W is increasing, and the other three gears are continuously decreasing. So far, the street lamp of this power range has occupied the highest proportion.

This statistic adds streetlights from Shenzhen, Liaoning and Finland. These sample data are representative of the LED streetlights. The area and quantity distribution of the sample production area are shown in Figure 2.

First, the light output of the tested lamp

Light output is also called luminous flux. The luminous flux of LED is studied to analyze the current light output capability of LED lamps, and the road conditions applicable to the LED light output values ​​are predicted according to the lighting standard values ​​specified by the national standard for road lighting.

1. Description of test data

Motor vehicle roads in cities are divided into express roads or trunk roads, secondary trunk roads and branch roads. The luminous flux of the street lamp is the basic condition for ensuring that the road surface meets the illumination level required by the road lighting standard.

According to the requirements of various national road lighting standards, we divide the light output (in lm) of LED street lamps into <2300, 23004000, 4000-5000, 5000-7500, 7500-9000, 9000-10500, 10500-12000, 12000-13500, 13500-15000 and >15000 10 segments. The number of LED street lamps falling in each segment and their statistics are shown in Table 1 and Figure 3. The luminous flux minimum is 2300lm. The minimum value of the LED road flux given by the DOE.

Street Light

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