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Thanks everyone for your help, I think I'll stick with the slight buzzing for now until I can warrant spending £100+ on new transformers, and the time to swap them all over!! I'm sure I'll be back on when that time arises!! Si

I'm pretty sure each light has it's own transformer, I checked that they were dimmable before I bought the switch, but didn't check anything else! It is when I turn them down that they buzz, so I'm sure your right, what's the best thing to do? Like I say if it's gonna be a big job I can live...

I'll get in the loft tomorrow and let you know. Cheers for your time

No, actually mate, 7 x 20W = 140W, with a 250W switch. I asked the question because it's easily livable with (good english!) so if it was the transformers I would leave it, but if I could get dimmable bulbs or a bulb that wouldn't buzz I would weigh that up. I know it's very hard to...

I have just fitted a wickes dimmer switch to my 7 downlights in my bathroom. The switch itself has a tiny buzz which is fine but there is a louder buzz from the lights/transformers, I have dimmable transformers. My question is... What actually causes the buzzing? Is it the lights, or the...