Road lighting for the different level of road in the value of illumination, regulation lighting power density values to achieve the purpose of saving energy. The LED lamp, generally we would recommend using optical design and LED the high directional light itself advantages to increase the distance between the lamp, and reduce the number of lamp is installed, reduce the total cost of the lamps LED. We suggest that in 40 x 30 ^ 2, under the surface area of 20 ~ 301x the average illuminance value is a reasonable initial target. Further energy-saving goal should be to 40 MB of light from 50-60m.