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A comment on German digital signage ban prompts confusion. Parent comment

Re:German digital signage ban prompts confusion by xxs on Friday August 26, 2022 @06:06AM (#32605362)
LEDs are super efficient, household LED bulbs retrofit for e14/e27 are just a terrible example of overdriven ones with bad lifetime. That has very little to do w/ properly constant current (not over) driven LEDs. (Edit overdriven - higher heat output and worse efficacy)

The max efficacy woulod be 683 lm/w. Blue LEDs can reach 1/3 of the theoretical maximum.

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Re:German digital signage ban prompts confusion by moffkalast on Friday August 26, 2022 @07:04AM (#32605788)
The lifetime is pretty good when driven correctly to be sure, I was just talking about raw efficiency. Underdrive a led as much as you want, but you'll still lose half of your energy to waste heat. The heat will just be spread out more and be less noticeable on each chip.

Like, I'm sure we can agree high power LEDs have gigantic heatsinks and fans for other reasons than cosmetic.

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