Solar-powered LunarGlo lighting consists of a tempered glass solar array and lithium-ion technology to provide a constant power source to four non-dimming LED bulbs in the roof-mounted light. Light output and charging levels are maintained through sealed internal circuitry at 26 Lux at 2 feet. The units are waterproof and will withstand high-pressure washing. Auto on and off is controlled by the sun, and there are no moving parts to wear out. This light mounts in roofs up to 7/8-inch thick in less than three minutes. A single battery charge provides up to 80 hours of lighting. The lights have been tested at -22 to 155 degrees F. Lights can be stored out of the sunlight for extended periods with no adverse effect on performance. 574/294-2624; www.lunarglo.com.