Hi, I am pondering the simplest way to have an audible warning in the house if a dog kennel infra red incandescent 175W bulb filament fails. I am sure once I achieve a nomally closed or open device I will be able to find a short range transmiiter and receiver to do the RF side. But how to perhaps monitor 50Hz AC mains current with a circuit to change state on no load being presented? The device needs to be at the supply end of the cable and not in the kennel, which rules out heat sensors or optical sensors near the lamp.. Thanks for any ideas!