I’m in the UK if it matters. I need to know which bulb out of these 4 takes the least electricity in order of least consumption first:
- 12 volt bathroom style GU10 halogen with transformer
- GU10 halogen
- Normal incadescent bulb
- LED

Assume all are kept on for the same duration and output 50W each. What would be the order of least power consumption first?
By LED I mean a 50W output LED in GU10 form.

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