lightn.光；光线；灯；打火机；领悟；浅色；天窗adj.轻的；浅色的；明亮的；轻松的；容易的；清淡的v.点燃；变亮；照亮adv.清楚地；轻便地light dope轻掺杂

1. The paper derives out the proper power supply voltage of city road lighting according to the illuminance and life span character at different voltage level.
   摘要根据路灯在不同电压下的照度及寿命特性，推导出城市道路照明灯具的最佳供电电压。