 Re: Best bulbs for an exposure unit?
Mine is not home made, but it does have 4, 24 inch unfiltered blacklight tubes. I expose my screens (I use a pure photopolymer, not a 2-part emulsion) in about 22 seconds. With the proper bulbs, you'll do much better, but you need to get rid of the acrylic and get ¼" CLEAR safety glass with NO UV protectant/film in it. The acrylic will scratch and even if you can't see the scratches, they'll be enough to give you less-than-sharp screens. |