Re: intensity of bulbs
I wanted to be less dependent upon the sun for my UV light source so I thought that I would start with a very basic setup and go from there. I bought 4 single strip black lights (24" long) at Home Depot ($15 each) and mounted them on a piece of ply, plugged into a power strip. The whole unit is suspended the height of a brick, on end, above my contact frame. The light strips are spaced about 2" apart, enough space that if I have problems with stripping I can add three more lights in the available open spaces. After a couple of experimental tries I had a success last night. I printed using CMYK separations with cyanotype being my first printing. I mixed the cyanotype 1 pt "A", 1pt "B" and 1 pt H20. I exposed for 5 min. Next came Cad Yellow for 3 min. Then Perm Rose for 3 min. Then instead of a K printing, I redid the C with Windsor Blue for 3 min. Here is the result that I am pleased with:
I will keep playing around to find optimum printing times and pigment strengths, and to find out if I need to add more lights to my array.
On Mon, Feb 23, 2009 at 6:22 PM, Gordon J. Holtslander <email@example.com> wrote:
I use 4 foot 40 watt tubes on my UV unit. I used 4 foot tubes because