The 12 v lamp solar cells

In CIE115, motor vehicle road is divided into five class M1 ~ M5, with an average luminance, luminance uniformity, luminance longitudinal uniformity, environment than and evaluate glare of incremental threshold value to evaluate the quality of road lighting, the evaluation contents and index are shown in table 1. Road in the United States

in CIE115, motor vehicle road is divided into five categories: M1 to M5. Road lighting quality by the average brightness, the total brightness uniformity, longitudinal brightness uniformity, environment and glare threshold value increment to evaluate. The evaluation contents and index are shown in table 1. Road lighting design standards in the United States, according to the complexity of road and traffic flow is divided into six types. For each type of roads, according to the different reflective material and traffic flow set different high and low, three levels of evaluation indexes. IESNA evaluation index, put forward three kinds of road lighting designer can according to their own needs to choose the appropriate index to carry on the design. These three indicators are illuminance index ( Including the average intensity of illumination and the intensity of illumination uniformity) , brightness index ( Including the average brightness uniformity, brightness and brightness longitudinal uniformity) And the small target visibility index. Among them, illuminance and brightness index contains glare brightness than the index evaluation. According to the CIE and the content of the IESNA road lighting design standards, can draw two types of motor vehicle lanes lighting design standard differences mainly reflects in the following three points: 1, the choice of evaluation index. Environmental impact assessment mainly adopts brightness index evaluation, including threshold incremental index and environment than the sensitivity index; IESNA, on the other hand, using three indicators, the intensity of illumination index, intensity index and small target visibility index STV, intensity of illumination index and brightness index are including screen brightness than the index to evaluate glare. 2. The calculation method of evaluation index. The main difference in brightness index calculation. CIE stipulated in each lane is only an observer, and fixed in the computing area starting position after 60 metres, observing a the brightness of the light cycle all matrix points ( As shown in figure 1) ； IESNA each row of the matrix calculation area designated point there should be an observer, and each observer is always in the line direction matrix 83 meters before the brightness of the observation matrix point ( As shown in figure 2) , which means that the observer IESNA standard not only lateral movement on the perpendicular to the direction of the lane, and longitudinal movement in parallel to the direction of the lane.