Streetlamp

Abstract

A streetlamp comprises a lamp holder, a power source and a fixing part, wherein the lamp holder comprises an LED lighting plate, a light distribution plate and a heating panel which are fixed to one another; each light distribution unit corresponds to one single LED luminous body; the back of the LED lighting plate is in tight joint with the heating panel; strip-shaped radiating rods are respectively fixed on two sides of the lamp holder; a top cover of the street lamp is arranged at the front ends of the radiating rods, while a back cover of the street lamp is arranged in a way of covering the heating panel; a distance is reserved between the back cover and the heating panel; the radiating rods, the heating panel, the top cover, and the back cover enclose to form a radiating space; a frame is arranged in the street lamp and fixed between the two radiating rods; the fixing part is arranged on the frame; and a bottom cover is arranged at the rear ends of the radiating rods. The street lamp adopting the structure gives out light more uniform in brightness; and the heat generated by the lamp holder can be in direct heat exchange with external environment, and the obstruction of a housing for radiating of the lamp holder is avoided, so that the heat radiating efficiency of the lamp holder is improved.

Description

technical field [0001] The invention relates to the technical field of lamps, in particular to a street lamp with good light direction performance and heat dissipation performance, with a lamp head fixed to a frame by a cooling rod. Background technique [0002] In vast areas such as outdoor roads and squares, traditional lighting fixtures are high-pressure sodium lamps or metal halide lamps. The light efficiency of high-pressure sodium lamps or metal halide lamps is 60-80lm / W, and the service life is about 6000 hours. At present, the luminous efficiency of LED lamps is 100-120lm / W, the lifespan is as high as 25,000 hours, and it does not contain harmful metal mercury. With the development of semiconductor technology, the performance of these aspects is still improving. Therefore, in recent years, environmentally friendly and energy-saving LED lighting fixtures have gradually become popular in the market. [0003] There are two main implementation forms of existing LED li...

AI Technical Summary

Problems solved by technology

These defects include: first, the directionality of the light is poor, and the area of ​​the light is not obvious, that is to say, it shines on unnecessary places

In the case of the same luminous flux, the brightness of the area that needs to be illuminated will decrease; secondly, the brightness is uneven, resulting in the phenomenon of being bright at a short distance and dark at a long distance. The illuminance of the area is much higher than the standard, because the light distribution is uneven, in order to make the dark area on both sides of the road and between two adjacent lights meet the lighting standard, so the design has to adopt a light source with higher power and higher luminous flux to meet the lighting standard. Meet the illumination requirements of the dark area, resulting in a waste of electric energy; third, the glare phenomenon cannot be eliminated

The so-called glare phenomenon means that when people observe a certain visual object, if there is a dazzling luminous point in the field of view, it will affect the observation effect and make people feel uncomfortable; They are all installed in the shell of street lamps, and the heat cannot be dissipated in time only by the cooling holes set on the shell. At present, more than 80% of the energy consumption of LEDs is converted into heat, and semiconductor devices are not resistant to high temperatures, so many The LEDs are concentrated in a relatively small space, and the continuously accumulated heat will make the temperature of the LED chip too high. If the generated heat cannot be dissipated immediately, the light efficiency and life of the LED will be seriously reduced at high temperatures.

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