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LED Street Lighting and Its Installation Arrangements

LED Street Lighting and Its Installation Arrangements

The led street lamps set up along the roads are more the type of high-pressure sodium, low-pressure sodium, electrodeless 1, metal halide and fluorescence than that from the incandescent, the high-pressure mercury and also the low-pressure sodium, simply because the latter ones have steadily been eliminated out of bad performance in lighting. To stop the occurrence of glare, the light power ought to be scientifically utilized via the lighting fixtures. That means the ray of light ought to be shed from a specified angle and produce a designed figure around the street. The more even of the light distribution, the brighter from the street and also the smaller sized from the glare. And light dissipation technology may be adopted at the peak of the light intensity to cut back glare.

Lighting facilities for road lighting can be roughly divided into three kinds: cut-off, half-cut and non-cut-off. The cut-off luminaire sheds light around the roads without any greater than 10 percent from the rated lumen from the light source and rays radiated along the roads, leading to much less glare. Consequently, it’s extensively used in streets, trunk lines, highways and expressways. Sharing some benefits from the former, the second one, shedding light around the roads with no greater than 30 percent of the rated lumen from the light source, is primarily applicable to the lighting of general grade streets. However, the third kind, is only suitable for the streets with good illuminating conditions or secondary streets with little visitors, because the luminous flux isn’t restricted at the peak of light intensity, creating enormous glare. The selection of lighting, determined from the elevation angle from the beam, has 3 degree: brief range, medium range and long range, based on the length from the illumination in the illuminator to street using the optimum beam.

Based on the segment type and the width of the road, the condition of the vehicle and the pedestrian, the lighting equipment can be arranged in numerous types, such as symmetrical or staggered arrangement on both sides of the street, simplex arrangement on 1 side, double crossing or central layout from the roads and so forth, while high pole lighting is adopted at the street junctions. In general, the lighting equipment is fixed symmetrically on both sides of roads with more than 20m in width and broadways, staggered on roads exceeding 15m in width and distributed on one side of narrower roads. Lighting fixtures are generally deployed at road intersections, corners, ramps, railroad crossings and crosswalks to assure the brightness, so that drivers and pedestrians can judge the street circumstances accurately. Much more over, it’s essential to take the driver’s adaptability to light modifications in installing lighting equipment in within and outdoors of the tunnels and the transitional section in the urban streets to the suburban roads. Placing briefly, a satisfactory lighting impact can be achieved by combining three parameters of designing–the energy, installation height and longitudinal spacing from the lighting fixtures.

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