The lamps do not fit in 4 different ceiling lights with Gu 10 Socket. In the first experiment, the light zertörte the ceramic support base my ceiling light. The ceramic base for lamp receptacle burst. The lights go back. I'm curious about the refund, because one of the lamps has wedged the screw in the base and was out again only by force. Here, one of the legs has replaced. And no, I'm not Grobmotoriker. Screwed, burst pedestal lamp was trapped. Never had I at GU 10, neither with nor with Led Halogen