I have two UV units. One consists of 24 inch BLB as close together as possible, 30 mm from the surface of the printing frame. There is no banding and I have used this unit for many years. The second unit is an HID lamp of 1000 W. I started with a 750 W unit, but this was too slow for me. The 1000 W unit provides times equivalent to the sun on a bright day in July in San Diego. I print almost all processes with one or both of these units.