I'm looking to change to GU10 from MR16.

I bought this: https://www.amazon.co.uk/gp/product/B0785RKFNN/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I've circled in blue where I attached the new GU10 lamp holder. I plugged in a GU10 bulb and the light doesn't come on.

What's going on here?

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  • what voltage is the lamp? – jsotola Jan 5 '19 at 8:21

In general, MR16 bulbs use 12 volts, which is the reason for the transformer (white box). GU10 bulbs, on the other hand, generally run directly on mains voltage (120 or 240 volts). So you are feeding 12 volts into a 120 or 240 volt bulb and it is barely light, maybe not visibly.

You need to look at the markings on the bulb and verify its voltage. If it is mains voltage, you need to remove the transformer and splice directly into the wires from the ceiling.

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  • Also, youwill now have mains voltage on a fixture that perhaps was never rated for it, and you will need to attend to earthing. Low voltage lighting is much simpler. – Harper - Reinstate Monica Jan 5 '19 at 17:22
  • @Harper He’s installing a prebuilt GU10 fixture. Hopefully, it’s rated for mains voltage. – DoxyLover Jan 6 '19 at 0:06
  • That was it. Works a treat after taking transformer off. Also the lamp holder I bought doesn't have earth and is rated for 240v – flux Jan 6 '19 at 20:37

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