I have been using a 400w metal halide light for all my alternative work until a friend gave me his homemade uv lightbox awhile back. It has the smaller diameter(8) 18" BL bulbs and is so much smaller and economical to use than the halide monster. I see many advantages to it's use over the halide. So, having said that I'd like to switch over to it full time. Do I have to retest all my palladium developers with it(I use dichromate in the dev.)? My standard print time was 10 minutes with the halide and it gave me 2 wedges on the step tablet pure black with a hint of lightening between step 2 and 3 and then progressive lightening on down the line with my developer that is in the middle as far as contrast goes. When I used the UV unit at about 4" from the print frame, and the same developer I had 5 steps that merged as pure black before I started to see any differences between the steps. Can I just plot this on WinPlotter and go from there? OR...... Would you suggest increasing the distance from the light and getting only 2-3 steps black with my standard 10 min. printing time and then plot that? Does it affect my outcome by where the steps that start to show a difference fall on the test print from the step tablet for getting my ES data? Thanks in advance!