Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

--- On Sun, 7/10/12, Jeff Heiss <jeff.heiss@...> wrote:

From: Jeff Heiss <jeff.heiss@...>
Subject: [Homebrew_PCBs] recommend a dark room light
To: Homebrew_PCBs@yahoogroups.com
Date: Sunday, 7 October, 2012, 3:38
















 









I am doing some tests with dry film photoresist. Can you guys recommend a

bulb that can be used for a dark room light? Are there any simple methods

to using a regular fluorescent or incandescent light for the purpose? Maybe

covering the bulb with a color saran rap as a filter?



Jeff



Hello Jeff,
If you are concerned about accidental exposure of the photo-resist under normal lighting conditions in your dark room, try covering a normal 50Watt incandesent bulb with a single layer of green arc-welding sheet.
These sheets are used by welders to surround the work area to prevent the UV rays from the arc from damaging other workers eyes.
This sheet is a leaf green colour, by assumption, a sheet of green "pin spot" gel should suffice(who remembers disco lights?)















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