The illuminators for street lighting can be roughly divided into three types: cut-off, half-cut and non-cut. 1 cut-off type: the light that the illuminator illuminates outside the road width does not exceed 10% of the rated luminous flux of the light source, and the control light is distributed along the road, and the glare generated is small. Suitable for major streets, trunk roads and highways. 2 Half-cut type: The light that the illuminator illuminates outside the road frame does not exceed 30% of the rated luminous flux of the light source, and the light is distributed along the road. Suitable for general grade streets. 3 Non-cutting type: The illuminator has no restriction on the luminous flux above the maximum light intensity, and the glare is large. It is only suitable for the streets with bright surroundings or secondary streets with few traffic. The range of the illuminator is determined by the elevation angle of the beam. It can be divided into short range, medium range and long range by the distance from the illuminator to the maximum illumination of the candle beam.