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Newsgroups: fido.photo
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From: "LNBOLCH@TELUSPLANET.NET"
 
Date: Fri, 16 Jan 04 19:31:46 +0100
Subject: Re: Compact fluoro lamp in enlarger
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Organization: Fanciful Online, San Diego, CA
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Message-ID: 
From: "Larry N. Bolch" 
To: 
References: 
Subject: Re: Compact fluoro lamp in enlarger
Date: Fri, 16 Jan 2004 20:31:45 -0700

Richard Prentiss wrote:
> I recently adapted a compact fluoroescent lamp to  my
> Beseler 23 enlarger. It is a 100 watt equivalent output
> in place of the original 75 watt tungsten. After being
> run for 15 minutes, the lamp housing is just pleasantly
> warm to the touch. As the upload prints show, the
> contrast varies markedly from the original type of
> lamp. Because of its method of operation, it seems
> to make much more blue light.This seems to be the
> reason that the exposure varies so much with the
> contrast filter. Having a $15 lamp that last for
> thousands of hours sounds much better than a $15
> lamp that could pop after a few hours running time
> and is best bought by mail order. Maybe using a
> permanent filter would bring the contrast range closer
> to normal.

Better yet, check to find one with a high CRI (colour rendering index). The
closer the number gets to 100, the closer it is to actual spectral light from a
continuous source such as the sun or an incandescent bulb.

http://www.topbulb.com/
http://www.atlaslightingsupply.com/fluorescent.html
http://care2.greenhome.com/products/lighting/light_bulbs/fsl000005/
http://www.fullspectrumsolutions.com/compact.htm

larry!
ICQ 76620504
http://www.larry-bolch.com/