In road lighting, the efficiency ratio of domestic universal light sources and electric appliances should be taken into account, and the spatial light distribution requirements of lighting fixtures, the design of lighting fixture reflectors, and the scientific calculations of road lighting should not be taken seriously. Due to the current road lighting in the future, it is necessary to enhance spatial light distribution requirements, select lighting fixtures in scientific areas, and ensure high lighting quality, save energy, and ensure traffic safety.
1. Luminous intensity requirements for road lighting
The road lighting quality evaluation index, IES, CIE and our country's national standards for road lighting uniform and clear luminous intensity requirements, including the following points:
1, road surface average brightness level
The relative sensitivity of the road surface average brightness horizontal impact on the vehicle, and the possibility of the impact detection. While on the road, the driver inspects the road surface obstacles in the background. The reason for this is that there is a minimum amount of constant and limited brightness difference (comparison) between the actual surface of the obstacle and the road surface. Illumination distribution in the viewing angle and the observer's eye in comparison with the requirements, the latter is determined by the observer's eyes. Greater visual angle (when the distance between the observer and the obstacle does not change, greater than the obstacle), higher road surface brightness, higher relative sensitivity to the eye, and greater opportunities for observing obstacles. The reason for this is the high road surface average brightness (some illuminance), which is advantageous for high-level drivers to observe (obstacles). The level of the average brightness level has a direct effect on the visual performance of the driver. Above average luminosity (but below the level of the existing glare luminosity to maintain demand), suitable for driving.
2、Lightness evenness on the road surface
The road surface brightness level is uniform, and the road lighting equipment can be used immediately to provide a good average brightness on the road surface. At the same time, the large difference in brightness in the field of vision, also caused a decrease in the relative sensitivity of the eye, which caused an instantaneous problem, so it was not easy to find some obstacles in the dark area. The reason for this is that each point in each area on the road surface has a certain amount of observation rate, which is necessary to determine the minimum brightness and the average brightness on the road surface. Brightness ratio. Under the circumstances where the brightness of the guaranteed brightness is uneven, the road surface may appear to be partially bright, and partially dark. Therefore, considering the suitability, the brightness difference between the brightest area and the darkest area on the road center line along the limited limit, is immediately balanced.
3, glare
Limiting glare during road lighting is an important indicator. 2 types of glare-possible components: ① so-called blind glare. Observing physical ability, direct impact to the driver observing physical ability. (2) So-called inadequate glare, normal induced inadequate feeling and fatigue, directly affected by the degree of inadequate driving.
4, Observation guide
The luminosity reference display for visual inability to read, but it is also an important factor in road lighting quality evaluation. The lighting system can provide good guidance, the direction of the road when the driver is standing outside a certain distance, the direction of the road, the effect of traffic safety, and the level of brightness and the glare control are important. Related to visual function and visual aptitude.
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