Have exchanged 15 pieces to 20W halogen spotlights. Light color is totally ok, illumination less concentrated than halogen, but just above the dining table entirely desirable. Soon about 30 pieces in the living room and the rest of the house will also be replaced again. Had at first feared that I would have to replace the transformers in the dining room, but was not necessary. Fit by the way perfectly and completely compatible with the halogen lamps. I'm very satisfied with that thing.