I see that some here are using HID mercury lamps for mask/photoresist exposure. Where can HID mercury lamps be obtained? Do they give better results than black lights or the yellow-housing halogen work lights found in home centers?
Jeff
--- In Homebrew_PCBs@yahoogroups.com, "Zoran A. Scepanovic" <zasto@...> wrote:
>
> 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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