Just put a Lithonia security light, 100 watt metal halide, on front of barn. Light won't come on although it is brand new. 120 volts getting to the light and properly wired. Sensor sits on top of light. I do come from breaker box to switch then onto the light. Switch is left on all time. Does it have to be wired direct from the breaker without a switch? I don't see why passing through the switch would keep it from coming on. Can't believe a brand new light fails to work. Any help would be appreciated.