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

Zdravo kirilian2351,

Sunday, February 8, 2004, 12:55:43 AM, ti rece:

k> I am wanting to build a UV light box. I have read as many internet
k> articles as I could find on the subject. Some articles will
k> recommend certain bulbs while other articles will say to stay away
k> from those that were recommended. What is the best bulb to use that
k> is easily obtainable? I have read an article that suggested using
k> bug zapper bulbs. My local Home Depot carries 15W and 40W versions
k> of the replacement bulbs for the Zapper models. Would this type of
k> bulb work? I have also read about breaking the glass shell of a
k> mercury vapor bulb and using the internal tube as a UV source. I
k> don't plan to make large circuit boards (no larger than 6" square).

DO NOT break the outer glass shell of a mercury vapour lamp! It will radiate a lot of short wave UV (UV-A) which is dangerous for eyes and skin, and it generates lot of ozone (O3). Good results could be obtained without breaking the outer glass shell.

I'm currently using 2 PHILIPS TL 20W/09N, and the exposure time from cca. 20cm is 5 minutes.

For determination of the correct exposure time I can suggest the 21 wedge stouffer gage (http://stouffer.net).

--
Sincerely,
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