[Alt-photo] UV light box

[Bob Cornelis]

I am planning on building a UV light box and have a question about the layout of the bulbs. Upon the recommendation of a friend who does alt process work I plan on buying these tubes:

http://www.1000bulbs.com/product/2220/F-20T12BL.html

My questions are how far apart should I mount these and how many do I need to provide good coverage to expose up to 20x24” (though I’m not sure I’d ever go over 16x20). I plan on having them about 4” above the surface of the prints.

Thanks
Bob

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