My HB flood lights stopped working recently, but if I turn the unit to "test", wave my hand in front of the sensor, the lights pop on. Turning it back to 1,5, or 10 minute timer delay does not work, even in the dark. Faulty opical sensor? Would that prevent the unit from operating in timer mode?

All at onece my outdoor motion light doesn't work. The red light is on at night, so I would assume I have power. What is the problem? And should I just buy a new one and install that?