I've referred to this site plenty of times, but now somethings happenned and I need help! I have recessed halogen downlighters upstairs. Each light has its own transformer. I put insulation in the loft last week, leaving what I thought was sufficient space around each fitting/transformer to prevent overheating. I had the lights on for several hours tonight, and when I went upstairs later on one of the bedrooms lights were all out. The other room was OK, and the rcd circuit which serves both rooms had not tripped. Could it be the dimmer switch serving the room that has overheated, or could one overheated transformer take out all the other lights in the loop? The thing that confuses me is that the other room is OK, even though it is on the same circuit. Any help or advice would be greatly appreciated