Mildly Interesting

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This is what the insides of a high pressure sodium (HPS) light bulb look like (lemmy.world)

submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/[email protected]

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[–] [email protected] 2 points 7 months ago

I searched it up:

It seems the smaller tube is pressurised, the larger bulb is under a vacuum. Some of the other diagrams also show a getter in the bulb, so it's a proper vacuum tube level vacuum.