7 ms·
IIRC, it's not exactly "more energy efficient", but rather "brighter light bulbs mean shorter lifespan" so you use the energy better but it's not inherently usi
by speps 3y ago
IIRC, it's not exactly "more energy efficient", but rather "brighter light bulbs mean shorter lifespan" so you use the energy better but it's not inherently using less energy, it's using the same energy to produce more light. It also explains why the light bulbs from TFA last so long, they're all pretty dim.
- weberer 3y agoWouldn't hotter bulbs mean less energy wasted as infrared light?
- greggsy 3y agoYou mean more?
- falcrist 3y agoTurns out it's less. Cooler bulbs seem to generate a larger fraction of their energy in the infrared. Hotter bulbs generate not only more light, but a greater fraction of that light is visible.
- montecarl 3y agoThis is easier to think about, if you consider the extremes. A very low power bulb generates no visible light, but still consumes energy. This is super inefficient. At higher temperature the peak shifts to longer wavelengths (i.e. visible). You can compare the black body radiation at different temperatures using Planck's law.[1] [1] https://en.wikipedia.org/wiki/Planck%27s_law#/media/File:Black_body.svg https://en.wikipedia.org/wiki/Planck%27s_law#/media/File:Bla...
- brazzy 3y ago>At higher temperature the peak shifts to longer wavelengths (i.e. visible) Shorter, not longer.
- josephg 3y ago> it's using the same energy to produce more light. That is, by definition, more energy efficient.
- LunaSea 3y agoNot if you need to produce a new light bulb
- rcxdude 3y agoNot obviously so. The embodied energy of an incendescent lightbulb could easily be dwarfed by the energy used in its lifetime. The relative cost of the bulb and the energy used to run it would certainly point to this being the case.
- bryanlarsen 3y agoTo restate your point: it's highly unlikely that a $1 light bulb contains more than $1 worth of energy.
- Workaccount2 3y agoA $1 dollar bulb can blow through a dollar of energy in about 100 hours. 200 hours if its a 50W. In the technology connections video he does the math to show that long life bulbs are just an all around loss.
- postmodest 3y ago(Bullshit numbers incoming) If one "forever bulb" can only output 10 lumens @10 watts but you need 100 lumens, and a "one year" bulb can create 100 lumens @60 watts, the disposable bulb wins.