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No Stupid Questions@lemmy.world • 2 years ago

If incandescent lightbulbs have a vacuum inside, why do they get so hot on the outside?

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If incandescent lightbulbs have a vacuum inside, why do they get so hot on the outside?

@Epic2112@lemmy.world to

No Stupid Questions@lemmy.world • 2 years ago

Shouldn’t the vacuum insulate the glass from the heat of the burning filament?

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7•2 years ago
I’m no lightbulb expert but I can tell you a vacuum still allows heat transfer via radiation. This is how we get warm from the sun.

I also doubt the inside of a filament lightbulb is a near perfect vacuum, but maybe a bulb expert will come along to shed some light on that.

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