Yeah wall plug efficiency is much harder since you need to do the power conversion as well, in a small and cheap way for mass production. I’d assume they have a specialized power supply for the big LED in the sky?
There are super efficient LEDs used in flashlights, the lumen per watt figures these days are absolutely crazy.
kkj@lemmy.dbzer0.com 15 hours ago
Flashlights are actually where wall-plug efficiency matters most, because nicer flashlights are limited almost entirely by heat. Even if we got to 98% efficiency, going from there to 99% would nearly double the brightness that you could fit in a given size.
Power input isn’t a problem at all, by contrast. A tabless 21700 can do 70A continuously without breaking a sweat, which is over 250W, and that’s with a 5Ah cell, which is plenty of capacity. A 6Ah cell can do about 10A, and that’s plenty for basically any single-cell light out there.