From what I have heard, the Berrger Contact paper is a lot faster than Azo. A light in a fixture may be too much. I print my Azo using my Omega D2 enlarger with a cold light. I take the negative carrier and the lens board out and move the focus all the way up. With the negative plane at 2 feet from the paper, I get reasonable exposures. A typical negative is around 15 seconds, a really dense one around 2 minutes. Hope this helps.