... power to give ultra high brightness.* Easy installation and maintenance, dust prevention, longer lifetime with high lumen maintenance. * Energy savings, no UV ... install or replace power supply, directly open the back cover with a screwdriver, then remove the power supply.On DC power ... Size, weight Lamp packing size(W ,L,H) /1pc640x560x250 mmLamp net weight15.5 kg Lamp gross weight (1pc/carton) 17 kg