... 10 years experience Solar traffic warning lamp, solar traffic lightTraffic barricade lamp, traffic warning lamp, traffic warning light, road block lamp, road block light, road hazard warning ... time:5 nights for a full charge;light sensor, flashing automaticaly when ambient light falls below 400lux.Frequency:flash rates from ... ---- +65°C. Normal operating humidity : 30% ----90% R.H. solar warning light