Incandescent vs. Halogen

Are halogen bulbs more, less or equally energy efficient as incandescent bulbs per lumen?

Halogen bulbs are much more efficient, lasting sometimes 3 times longer than ‘normal’ bulbs and generating more light for the same amount of imput power.

I’ve seen figures where these bulbs are from 3 to 5 times more efficient.

But AFAIK they’re more expensive with may put people off buying them in the first place.

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