system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are LEDs brighter and more powerful, yet use so little energy?

Ex: Police Lightbars, they're so bright but use so little of the cars battery. Much less than the classic rotating lights.
gpt
You know a lot of light is invisible, right? Infrared, for example. You can't see it, but you can feel it on your skin with your eyes closed when you're standing near something really hot.

Take two lightbulbs that consume exactly the same amount of electric energy, but one produces only visible light, and the other products half visible light and half invisible. The second one will look much dimmer.

The old-timey incandescent filament lightbulbs, the ones that burn your fingers to the touch, they produce mostly infrareds! To the tune of 90%!

That's why so much progress has been done. Because there was so much room for progress.

LED lights produce mostly visible light. Do this is it. There won't be much progress anymore. We're there. We can focus on other things now. Cool, hey?