Then replace the 4 incandecents (15w, 120vac, each) with 4 dimmable LED spots that use 3.2 watts a piece. But I don't know the kind of efficiency that transformers have. I would think that adding a transformer on the circuit, 60 feet down the run would be adding to the losses already incurred by the inverter. Right now I have a branch circut with 4 recessed lights in a room and I run them off a Morningstar SureSine, 300 W inverter. I'm not sure that would be the most efficient method to retrofit wiring for 12v, I suspect some electricity would be lost as heat in the transformation process. So I was wondering if anyone has used or knew the effeciency of 120vac/12v transformers. Selecting a wire for 3 percent loss would require a substantial investment in 6 or better yet 4 gauge wire just to hook up 4 LED lights that draw a couple amps! I have one run that is 12 gauge romex that is a 75 foot long one way run. I really like the efficiency and selection of 12v lighting although a big problem with 12v lighting is the wire sizes required to handle even a few amps on longer runs.
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