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@Brommers
I've replaced the G4 10W halogen bulbs in the Sputnik light fitting in my bedroom with 2W LED ones - all 12 of them. The bulbs are nice and bright but the transformer's now making a high-pitched faint ringing sound. I take it I need to swap out the transformer for a DC LED driver? If so, any recommendations? It needs to be quite weeny as the shroud at the top of the light fitting which conceals the transformer is about 12cm in diameter.