I've been wanting to assemble an emergency light using UPS as its power source. Masyado kasing madaling masira mga nabibiling emergency lights.

What I plan to do is mag latag ng wires from a single UPS to the different locations requiring emergency lights pag brownout. Ang hindi ko lang alam gawin is the trigger that will turn on the lights pag brownout. Anong device ang tawag sa trigger na ito? (if may power, the circuit is open, if nawala power, the circuit will be closed).

I'll be using LED bulbs for the lights para mas tumagal ang battery ng UPS.