I'm using this paper also, on 5x7. Fifteen watt bulb about 3-4 feet above the printing frame. Exposure times usually about 45 sec. to 1 1/2 minutes. To control contrast I let print stand (no agitation) in developer after image emerges. I'm new at this having only printed previously on Centennial POP, which disappeared after my first order. I hope this stuff sticks around.