[pure-silver] Re: Enlarger Lamp Life
----- Original Message ----- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, October 29, 2008 10:08 AM
Subject: [pure-silver] Re: Enlarger Lamp Life
FWIW, RCA numbers for life of pure tungsten vacuum tube filiments is that reducing voltage by 5% doubles life, 10% extends it four times. A 5% increase reduces life by about 25%. Tungsten light bulbs should be identical. 

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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