Halogen will work. I used it for a while and it made very nice screens. But if you can afford it, find a used Metal Halide fixture. These are being replaced like crazy in schools and shops, so you might be able to find one for free. I use a 400w now and love it. With the Halogen, I was burning screens with Ulano QTX in about 15 minutes. When I want to MH, it went down to 1 1/2 minutes.
