i actually posted a similar question to the Large Format Mailing list a 
couple of months ago.

For 4x5, which as my interest at the time, the consensus was the quickest 
route would be to buy a second hand Aristo source or the equivalent. 

For larger formats, where second hand equipment is not so common, DYI 
construction may be far more cost effective.

The Omegalite, I understand, is a simple (household type) ring 
fluorescent tube with a reflector. A really interesting suggestion posted 
in response to my query was the use of a styrofoam surface as the 
reflecting body. One could image a home built cold light source, 
contained in a simple box,  where the baffled circular fluorescent 
reflects from a small panel of styrofoam wall insulation, then through a 
piece of opal plastic or homemade groundglass just above the negative. 
The parts for this would probably go for les than $15 new.

Ed
Balko


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