Mildly Interesting

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

submitted 5 months ago* (last edited 5 months ago) by [email protected] to c/[email protected]

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[–] [email protected] 2 points 5 months ago (1 children)

How much pressure? Is the bulb pressurized or the smaller tube? Is it normal air or something specific like nitrogen?

[–] [email protected] 2 points 5 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.

[–] Galapagon 1 points 5 months ago

"looks like an LED oh wait it's in front of the LED" thanks brain