light bulb pressure

[pbarra1]

what is the gas pressure inside a regular incandescent bulb. GIA

[BigGuynRusty]

[quote pbarra1]what is the gas pressure inside a regular incandescent bulb. GIA Not high pressure, it is under a vacuum.
Why are you asking?

BGnR

[pbarra1]

in a workshop and last demo proved it's not a vacuum. In order to explain each demo requires the exact internal pressure.

[OWC Jamie]

no vacumn
inert gas nitrogen or argon or a combination IIRC.
Halogens of course are filled with halogen gas.

[JoeH]

Standard bulbs contain a near vacuum, otherwise the filament would burn up. Some bulbs use inert gas such as argon, but those are more expensive.

[BigGuynRusty]

[quote pbarra1]in a workshop and last demo proved it's not a vacuum. In order to explain each demo requires the exact internal pressure. Depends on the bulb.
Contact the manufacturer, seriously.

BGnR

[papercup]

Read the dials @ 3:20

http://www.youtube.com/watch?v=BylLOWRojyY

[Tofer]

Edited: this is what I get for opening a link and waiting 15 minutes to reply...

Are you sure it's a vacuum? I understood that it was filled with argon gas.

-Tofer

[Filliam H. Muffman]

In an much older version of that video, I remember hearing that bulbs were filled with argon gas at a partial vacuum when cold so that the bulb would not be under much pressure if they broke when turned on. Hot glass shards spraying around a room could ruin your day.

[lafinfil]

[quote Filliam H. Muffman] Hot glass shards spraying around a room could ruin your day.
True that !

I was photographing at an event and the videographer working next to me had a 250 watt quartz bulb blow.
It was in a Lowell Tote-a-Light and the idiot didn't have a safety cage on a bare bulb.

The hot glass shards started a small fire on the carpet and a chair.