It has the function of directional light emission, because almost all power LEDs are equipped with reflectors, and the efficiency of such reflectors is significantly higher than that of lamps. In addition, the efficiency of the self-reflector has been included in the detection of LED light efficiency. Road lamps using LEDs should make full use of the characteristics of the directional emitted light of the LEDs, so that each LED in the road lamps directs the light directly to each area of the illuminated road surface, and then uses the auxiliary light distribution of the lamp reflector to achieve Very reasonable comprehensive light distribution of road lamps. It should be said that road luminaires must truly meet the illuminance and illuminance uniformity requirements of CJJ45-2006 and CIE31 and CIE115 standards. The luminaire should include the function of three times light distribution to achieve a better realization. LEDs with reflectors and reasonable beam output angles themselves have a good primary light distribution function. In the lamp, the installation position of each LED and the direction of the emitted light can be designed according to the height of the road lamp and the width of the road surface to achieve a good secondary light distribution function. The reflector in this type of lamp is only used as an auxiliary third light distribution method to ensure better uniformity of road illumination.