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.

Read More >>