built a lightbox, first two test burns did not wash out at all. . . mixed new batch of emulsion, and test step wedge last night all washed out, but at least i could start to see the design on the top part. . i think it may simply need to be exposed more, but i think the sylvania 200w heat lamp bulb I am using might be cause some problems. . .using a regular 120v light fixture, where can I find an affordable bulb that will do the job right, mostly because I don't know how to tell what is right, because the light bulb boxes don't say, "UV lighting" or anything. . ?