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+--- Thread: light bulb pressure (/showthread.php?tid=59701)
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light bulb pressure - pbarra1 - 08-06-2008
what is the gas pressure inside a regular incandescent bulb. GIA
Re: light bulb pressure - BigGuynRusty - 08-06-2008
[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
Re: light bulb pressure - pbarra1 - 08-06-2008
in a workshop and last demo proved it's not a vacuum. In order to explain each demo requires the exact internal pressure.
Re: light bulb pressure - OWC Jamie - 08-06-2008
no vacumn
inert gas nitrogen or argon or a combination IIRC.
Halogens of course are filled with halogen gas.
Re: light bulb pressure - JoeH - 08-06-2008
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.
Re: light bulb pressure - BigGuynRusty - 08-06-2008
[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
Re: light bulb pressure - papercup - 08-06-2008
Read the dials @ 3:20
http://www.youtube.com/watch?v=BylLOWRojyY
Re: light bulb pressure - Tofer - 08-06-2008
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
Re: light bulb pressure - Filliam H. Muffman - 08-06-2008
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.
Re: light bulb pressure - lafinfil - 08-06-2008
[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.