The status quo of ordinary road lighting and LED light source

　　1, the general status of the ordinary road lighting

　　Current road lighting is commonly using high pressure sodium light source or metal halide light source. The main characteristics of these two light sources are the small size of the arc tube emits light by the small size of the arc tube to produce a large optical output and having a high light efficiency, the former including ancillary appliances, up to 110lm / w, the latter including ancillary appliances up to 80lm / w. However, when applying such a way the light source lamp, only about 40% of the light can pass through the glass directly to the road, the other light to be projected by the lighting fixture reflector is currently widely used in the traditional lighting sources such there are two basic deficiencies , one in the direction of direct exposure to high illumination lamps on secondary roads up 50lx more apparent over the region belong to the lighting , and the illumination light at the intersection of the two lamps only light 40% ~ 20% under illumination . Second, the efficiency of this type of reflector lamps typically 75% ( international brands of road lighting ) , and above over the illuminated area also belongs to waste too much illumination.

　　2, the current status of the use of LED road lighting

　　The most common form of LED road lamps in use are mainly three types , one is the traditional road lamp housing , but in the lamps, in an almost flat mounting surface ( also reflective surface) , fitted with a matrix of the LED, this design of the lamp is impossible to get a good light distribution . The other is the number of LED integrated within a circular area ( area diameter of about 30mm ~ 40mm), so that the density of the light output of a small area near the high -intensity discharge lamps , re-use of light distribution reflector lamps but lighting luminosity distribution of this design is not superior to the conventional road lighting , and because in a small area of high -density integrated LED, LED heat dissipation significantly adverse circumstances , affect not only the LED luminous efficiency , but also tend to affect the service life of LED . The third category by designing an optical lens , and packaged in high-power LED light source , a lens through which to change the direction of the light source for emitting to the propagation direction shifted to increasing the utilization of lighting fixtures.