[Alt-photo] Re: UV light box

[Laura V]

Hi Bob,
I was asking here about lighting a couple of months ago and got this 
link from Kees Brandenburg showing his lightbox (maybe he's too busy 
moving the list to see this thread) :)
http://polychrome.nl/techlog/simple-and-cheap-uv-unit

As you can see, the bulbs look pretty close together. I ended up having 
a similar unit built (which took almost 3 months - I just picked it up 
so haven't tried it yet!) I had the electrical part done at a place 
specializing in fluorescent lighting and asked them to put the bulbs as 
close together as was safe to do so. It's in the trunk of my car down 
the street at the moment and it's snowing, so I'll get back to you as to 
the exact distance. Mine has 10 bulbs and the width is smaller than the 
24" (60cm) length, so that is a lot closer than 4 inches apart.

Perhaps someone else can fill us in whether they need to be that close 
together, or maybe it's just a matter of the more bulbs the quicker the 
exposure.

Best Regards,
Laura

On 3/4/14 9:43 PM, Bob Cornelis wrote:
> 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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