OT:Incandescent "soft white" bulb coating?
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Posted by Bob Masta on January 21, 2005, 5:17 pm
Please log in for more thread options lighting gurus hang out here. (Google hasn't been any help so far.) What is the stuff used as the coating on typical incandescent "soft white" bulbs? I gather that the non-soft-white are simply acid etched on the inside of the envelope, but the soft white have a separate powder applied somehow. What is this stuff chemically? What makes it stick? (It seems pretty fragile if you touch it on a broken envelope piece.) Thanks! Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis www.daqarta.com | ||||||||||||||||||||||
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Posted by Sylvan Butler on January 21, 2005, 6:19 pm
Please log in for more thread options Doesn't stuck much... Even the broken pieces of filament swirled around inside the bulb scrape off the powder. Hopefully it is just some talc, gypsum, ... sdb -- Wanted: Omnibook 800 & accessories, cheap, working or not sdbuse1 on mailhost bigfoot.com | ||||||||||||||||||||||
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Posted by Dan Ritter on January 21, 2005, 10:36 pm
Please log in for more thread options Bob Masta wrote:
> Not exactly an electronics question, but I know some
All I know is that at least in flourescant lights they use different
> lighting gurus hang out here. (Google hasn't been any > help so far.) > > What is the stuff used as the coating on typical > incandescent "soft white" bulbs? I gather that > the non-soft-white are simply acid etched on the > inside of the envelope, but the soft white have > a separate powder applied somehow. What > is this stuff chemically? What makes it stick? > (It seems pretty fragile if you touch it on a > broken envelope piece.) > > Thanks! > > > Bob Masta > dqatechATdaqartaDOTcom > > D A Q A R T A > Data AcQuisition And Real-Time Analysis > www.daqarta.com shades of colored phosphors. I would imagine it's the same stuff but I don't know. | ||||||||||||||||||||||
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Posted by Jonathan Kirwan on January 22, 2005, 4:58 am
Please log in for more thread options On Fri, 21 Jan 2005 14:17:43 GMT, NoSpam@daqarta.com (Bob Masta) wrote:
>Not exactly an electronics question, but I know some
>lighting gurus hang out here. (Google hasn't been any >help so far.) > >What is the stuff used as the coating on typical >incandescent "soft white" bulbs? I gather that >the non-soft-white are simply acid etched on the >inside of the envelope, but the soft white have >a separate powder applied somehow. What >is this stuff chemically? What makes it stick? >(It seems pretty fragile if you touch it on a >broken envelope piece.) The two commonly used finishes inside are etched glass (frosted) and applied silica powder. As I said, the etched glass is known as 'inside-frosted' or simply 'frosted' and results in the appearance of a glowing ball of light within the globe. But silica powder is also used, and called 'soft-white' by most major manufacturers. Although this cuts output more than etched glass, it makes the entire bulb glow more evenly. I hope this helps some. Jon | ||||||||||||||||||||||
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Posted by Bob Masta on January 22, 2005, 5:26 pm
Please log in for more thread options On Sat, 22 Jan 2005 01:58:33 GMT, Jonathan Kirwan
>On Fri, 21 Jan 2005 14:17:43 GMT, NoSpam@daqarta.com (Bob Masta) wrote:
> >>Not exactly an electronics question, but I know some
>>lighting gurus hang out here. (Google hasn't been any >>help so far.) >> >>What is the stuff used as the coating on typical >>incandescent "soft white" bulbs? I gather that >>the non-soft-white are simply acid etched on the >>inside of the envelope, but the soft white have >>a separate powder applied somehow. What >>is this stuff chemically? What makes it stick? >>(It seems pretty fragile if you touch it on a >>broken envelope piece.) >
>The two commonly used finishes inside are etched glass (frosted) and applied >silica powder. As I said, the etched glass is known as 'inside-frosted' or >simply 'frosted' and results in the appearance of a glowing ball of light within >the globe. But silica powder is also used, and called 'soft-white' by most >major manufacturers. Although this cuts output more than etched glass, it makes >the entire bulb glow more evenly. > >I hope this helps some. > Thanks, Jon, this is exactly the sort of info I was hoping for. Any idea what makes the silica stay on the inside of the envelope? Thanks again! Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis www.daqarta.com | ||||||||||||||||||||||
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> incandescent "soft white" bulbs? I gather that
> the non-soft-white are simply acid etched on the
> inside of the envelope, but the soft white have
> a separate powder applied somehow. What
> is this stuff chemically? What makes it stick?
> (It seems pretty fragile if you touch it on a
> broken envelope piece.)