I've been fitting tons of GU10 led's without transformers. Usually the GU10 format implies that they are 240v. Most of the GU10 leds dim these days and the easiest dimmer modules to set up are v-pro. You can replace the module only for around £10 and keep your existing dimmer plate and knob if you already have dimmers.
Are you sure you're looking at GU10's not MR16's which always need a transformer.
Do you have a good source for these? I've bought been replacing dimmers all over our house but there are a couple of double/triple plates with different requirements per circuit.
I've been fitting tons of GU10 led's without transformers. Usually the GU10 format implies that they are 240v. Most of the GU10 leds dim these days and the easiest dimmer modules to set up are v-pro. You can replace the module only for around £10 and keep your existing dimmer plate and knob if you already have dimmers.
Are you sure you're looking at GU10's not MR16's which always need a transformer.