I have for my living room ceiling lighting (rail system) 6 piece 75 watt halogen. Always had a bad conscience when switching as 450 watts? and everyone talks about the energy savings. Now God seis these 15 Watt LED thanked used 90 watts and 360 watts saved, simply Super Best warm light indistinguishable to the previous halogen lamps on the contrary, felt even better. Payback? Cheap they are not, but the halogen was not paid.