Oct 22, 2021 · They also have a beam angle of 120 degrees, a life span of more than 50,000 hours, and a color temperature of 5,500K to 6,600K (daylight). At Ecoshift Corporation, our solar-powered square LED road studs have a working temperature of -20 °C ~ +70 °C and a battery of NI-MH 1.2V/600mAh.