I am really excited by these lamps. They are almost brighter than 20W halogen lamps, emit in a pleasant, natural light, which is almost as warm as that of halogen lamps. I operate on an AC-Travo (12 V AC), because I simply replaced the existing halogen lights. No problems, no flickering, no ignition delay. small drawbacks: 1. they do not radiate equally in all directions but more upwards. 2. They are pretty hot at the base still.
