If incandescent lightbulbs have a vacuum inside, why do they get so hot on the outside?
![](https://lemmy.world/pictrs/image/0943eca5-c4c2-4d65-acc2-7e220598f99e.png)
Shouldn't the vacuum insulate the glass from the heat of the burning filament?
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Shouldn't the vacuum insulate the glass from the heat of the burning filament?
And those are usually made out of some metal, that'll do pretty good reflecting radiation heat transfer