...switch to LED lamps costs roughly the same as replacing...
aDisconnecting the ballast to switch to LED lamps costs roughly the same as replacing the ballast with one designed for a single fluorescent lamp, and would save as much energy. 分开石碴大致交换到LED灯费用同替换石碴一样用为一盏唯一日光灯设计的一个,和将节省同样多能量。[translate]...