Hi I have just taken down a normal light fitting and placed a mains halogen fitting in its place and also joined another mains halogen fitting further down the wall. This is ok isn't it? Everything is working fine. I have a dimmer at the top of the stairs and a normal switch at the bottom, and when i turned the dimmer down i got a buzzing noise as if electric is going through something i understand that dimmers can do this and i can hear it when i put my ear to the dimmer but when i turned the dimmer back up to full i could hear a buzzing noise still and i found it was 1 of the mains halogen fittings. Do mains halogen fittings/bulbs buzz at all? They are brand new so do the GU10 bulbs buzz when new possibly? I have to admit I can't hear the loud buzzing anymore. The dimmer switch was there when i moved in so it could be old and i don't know the rating of it ( i haven't checked) and i do have a new silver/touch/remote dimmer to put on. 1 thing i have noticed is that there is a ceiling light also and that has a energy saving lamp in it and before i changed the wall lights when i turned the dimmer down it would flicker which i understand energy saving lights can't be dimmed, but now i have these halogens on the wall when i dim the ceiling light doesn't flicker anymore. Could this lamp have something to do with the whole problem? Should i just but a normal bulb in this fitting?