I don't have a volt meter, so I really don't know what the power level is going to my smoke detectors. However, they are old and past their useful life. I intend to replace them with battery operated. One of them in I an alcove outside my bedroom and near a storage closet that has no light. Am I crazy to think I can install a ceiling light in place of the detector since there is already wiring there? I've been reading that many Hardwired units operated on 125 volts, but I can't measure it, and there is no breaker in the box that supports that idea. What do you think?