The test results of LED street lights and other street lights jointly organized by Shenzhen Lighting Environmental Management Center, Shenzhen Science and Technology and Information Bureau and Shenzhen Electronic Product Quality Testing Center have been published on the website of relevant units. The test samples include 27 LED street lights and 1 CosmoPlis street light. And 2 high pressure sodium street lights. The test time is from March to July 2009 and is divided into two parts: pavement test and laboratory test. The pavement test is three times, the switch lights are normally turned on every day, and the total lighting time is about 1200 hours, focusing on the actual lighting effect and environmental adaptability of the product; the laboratory test is twice, the middle 2000 hours of continuous lighting, focusing on the optical characteristics and stability of the product. performance.
The purpose of this test is to provide reference for the promotion of LED street lights in Shenzhen, to promote the implementation of demonstration projects; to carry out application research, to provide technical support for scale applications and local standards development. At the same time, it also provides a platform for LED street lamp companies to learn from each other and learn from each other. Through the research on the test results, this paper makes a preliminary analysis of each technical index and puts forward relevant suggestions.
1. Analysis of technical indicators
(1) Light effect
According to the overall lighting effect of Table 1, the average value of 27 LED street lamps is slightly better than the 100W sodium lamp, and there is still a big gap between Philips CosmoPlis and 150W sodium lamps. In terms of applied light effect, the average value of LED is close to 150W sodium lamp in the area of ​​12m×33m, 17.6% over 100W sodium lamp; 10.2% over 150W sodium lamp in 9m×33m area, and 32.2% over 100W sodium lamp. Obviously, the utilization factor of LED street lamps is higher than that of CosmoPlis and sodium lamps, and the narrower the path, the more obvious. From the utilization factor, the average value of the LED is increased by 0.13 in the region of 12 m × 33 m than in Cosmo Plis, and is expanded to 0.16 in the region of 9 m × 33 m. However, there is a contradiction between the utilization coefficient and the lateral uniformity. The increase in the utilization factor will inevitably lead to a decrease in the lateral uniformity, which in turn affects the overall uniformity and the environmental ratio.
The overall lighting effect of LED street lamps is still different from that of CosmoPlis and high-power sodium lamps. It is a realistic choice to achieve better application of light efficiency by increasing the utilization factor. Due to the directional illuminating characteristics of the LED and the good light control capability, the utilization coefficient of the LED street lamp can be improved by about 0.05 compared with the existing mainstream illumination under the premise of uniformity. From the perspective of application light efficiency, LED street lamps with higher indicators have surpassed CosmoPlis and 250W sodium lamps, and gradually approached 400W sodium lamps. The main road application has been exposed. However, considering the energy-saving effect and comparative advantages, LED street lamps should still be based on narrow roads and branches with narrow roads, and gain advantages and then penetrate into the main roads.
Table 1: Relationship between overall lighting efficiency and applied light efficiency
Note: The application of light efficiency and lateral uniformity is the innovation of this test. The application of light efficiency refers to setting the effective light effect of the road surface in the application area. The calculation formula is the total light-passing lamp input power in the application area; the lateral illumination uniformity Refer to the concept of longitudinal illuminance uniformity, which is the ratio of the minimum illuminance to the maximum illuminance of the measuring point in the lateral direction of the road.
The purpose of this test is to provide reference for the promotion of LED street lights in Shenzhen, to promote the implementation of demonstration projects; to carry out application research, to provide technical support for scale applications and local standards development. At the same time, it also provides a platform for LED street lamp companies to learn from each other and learn from each other. Through the research on the test results, this paper makes a preliminary analysis of each technical index and puts forward relevant suggestions.
1. Analysis of technical indicators
(1) Light effect
According to the overall lighting effect of Table 1, the average value of 27 LED street lamps is slightly better than the 100W sodium lamp, and there is still a big gap between Philips CosmoPlis and 150W sodium lamps. In terms of applied light effect, the average value of LED is close to 150W sodium lamp in the area of ​​12m×33m, 17.6% over 100W sodium lamp; 10.2% over 150W sodium lamp in 9m×33m area, and 32.2% over 100W sodium lamp. Obviously, the utilization factor of LED street lamps is higher than that of CosmoPlis and sodium lamps, and the narrower the path, the more obvious. From the utilization factor, the average value of the LED is increased by 0.13 in the region of 12 m × 33 m than in Cosmo Plis, and is expanded to 0.16 in the region of 9 m × 33 m. However, there is a contradiction between the utilization coefficient and the lateral uniformity. The increase in the utilization factor will inevitably lead to a decrease in the lateral uniformity, which in turn affects the overall uniformity and the environmental ratio.
The overall lighting effect of LED street lamps is still different from that of CosmoPlis and high-power sodium lamps. It is a realistic choice to achieve better application of light efficiency by increasing the utilization factor. Due to the directional illuminating characteristics of the LED and the good light control capability, the utilization coefficient of the LED street lamp can be improved by about 0.05 compared with the existing mainstream illumination under the premise of uniformity. From the perspective of application light efficiency, LED street lamps with higher indicators have surpassed CosmoPlis and 250W sodium lamps, and gradually approached 400W sodium lamps. The main road application has been exposed. However, considering the energy-saving effect and comparative advantages, LED street lamps should still be based on narrow roads and branches with narrow roads, and gain advantages and then penetrate into the main roads.
Table 1: Relationship between overall lighting efficiency and applied light efficiency
Street light type | Overall lighting effect (Lm/W) | 12m×33m | 9m×33m | ||||
Applied light effect (Lm/W) | Utilization factor | Landscape Evenness | Applied light effect (Lm/W) | Utilization factor | Landscape Evenness | ||
The highest light efficiency LED | 81.5 | 48.9 | 0.60 | 0.42 | 39.3 | 0.48 | 0.53 |
Apply the highest luminous efficiency LED | 79.6 | 49.9 | 0.63 | 0.43 | 40.2 | 0.51 | 0.52 |
54.8 | 36.1 | 0.66 | 0.21 | 31.2 | 0.57 | 0.38 | |
CosmoPlis | 85.1 | 45.0 | 0.53 | 0.45 | 34.5 | 0.41 | 0.45 |
150W sodium lamp | 67.3 | 36.4 | 0.54 | 0.50 | 28.3 | 0.42 | 0.53 |
100W sodium lamp | 54.4 | 30.7 | 0.56 | 0.48 | 23.6 | 0.43 | 0.52 |
Note: The application of light efficiency and lateral uniformity is the innovation of this test. The application of light efficiency refers to setting the effective light effect of the road surface in the application area. The calculation formula is the total light-passing lamp input power in the application area; the lateral illumination uniformity Refer to the concept of longitudinal illuminance uniformity, which is the ratio of the minimum illuminance to the maximum illuminance of the measuring point in the lateral direction of the road.