Homebrew PCBs

On Mon, 22 Jul 2013 21:27:19 -0000, you wrote:

>My 60 watt incandescent yellow bug light finally burned out after years of use. I checked several stores (Walmart, Home Depot, Lowes) for a replacement but none found. Walmart had a 90 watt one but I think that would be too bright for my dry film darkroom use.
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>Has anyone had any experience with the yellow fluorescent bulbs used as a dark room bulb? I'm concerned that since it is a fluorescent source it may still emit UV. Or does the yellow glass effectively block the UV?
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IIRC yellow tubes were once used in offset print darkrooms.
Might be interesting to check with printing supply houses.

Years ago we used 15 watt standard start red tubes
in the photographic darkroom for printing, even with
polycontrast paper. Safer than the high dollar Kodak
gel filters and 2x-3x brighter. We had to wrap a strip 
of black tape on each end because the phosphor wasn't 
real good at the ends. Rapid start tubes did not work at all, 
may as well use white.

Keith Bowers WB4LSJ- Thomasville, NC