I asked him “what color were the clouds back then?” and he said they were white. I asked him what happens if I take an orange light and light up something that’s white with it. He ignored me. He went on about how everyone in his age group remembers the Sun being orange, and by me questioning him, I’m calling him and all his peers liars and I’m stupid because I’m younger than him and vaccinated.
LEDs produce about half their input energy in heat, with the other half being light. Incandescent bulbs output about 90% as heat and 10% as light.
This can very a lot depending on the LED. The average LED is indeed somewhere around the 50% and 60% mark. But there are LEDs out there that can get up to 90+%
The highest I’m seeing for wall-plug efficiency (i.e. the percentage of the consumed electricity that’s released as light rather than heat) is 83.2%, and that’s for red LEDs. For anything you’d want to use for general-purpose lighting, the number is much lower.
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.
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.