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The original was posted on /r/explainlikeimfive by /u/Reasonable_Pool5953 on 2023-07-01 17:16:58+00:00.

ELI5 Not sure the question requires much explanation.

Halogens are famous for being brighter than incandescent bulbs (more lumens per watt).

They are also famous for producing a lot of heat, relative to incandescent bulbs.

How can they be both without violating basic laws of physics?