Re: Lighting question
Re: Lighting question
- Subject: Re: Lighting question
- From: Roger Breton <email@hidden>
- Date: Fri, 19 Nov 2004 09:24:38 -0500
> U.V. will make the proofing stock glow. The paper you're going to eventually
> print on or the original you're matching may glow more, less or not at all.
> Best to eliminate it. The industry has gone full circle on this according to
> the engineer I spoke with at GTI who sells proofing lamps and booths. They
> had some u.v. in their tubes, then a lot, and now the newest tubes have
> almost none. If you have one and your printer has another bad things can
> happen. Ask me how I know!
>
> jc
Thank's John!
You wrote that some lamps have u.v. in their tubes. In the modest amount of
readings I've done on fluorescent lamps, they all start off an electrical
arc at high voltage which produces light emission by ionizing a pressurized
mercury vapor gas. And as you know mercury has strong UV emission, some
visible emission too. I couldn't say whether it's most concentrated in the
UV part of the spectrum but it's there nevertheless. What I gather happens
is that the inside of the tube is coated with various qualities of phosphors
which re-emit the UV every from the mercury emission into the visible part
of the spectrum, just like phosphors on a CRT.
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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