When you say holder do you mean 'the bit the bulb goes into + the transformer'? Happy to swap out to GU10 since a replacement would be far easier to buy in the supermarket than my existing GU4/MR11 ones..
There's no need for a transformer with GU10, it's built into the lamp. The holder is the bit that fits into the ceiling and holds the lamp.
@Airhead started
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When you say holder do you mean 'the bit the bulb goes into + the transformer'? Happy to swap out to GU10 since a replacement would be far easier to buy in the supermarket than my existing GU4/MR11 ones..