My bulb is only a foot-and-a-half above the paper - far too close for a spotlight to give even coverage. That's why I have to use a flood light.
When I started with Azo, I was exposing and developing by the Fred Picker "thinest negative" principal. Then my exposures were running 10-30 seconds. Now that I've adopted the dense negative system (discussed here and at michaelandpaula.com at length) my exposures have been from about 50 seconds to 3-minutes. I consider myself still at the experimental stage with this system. These negatives are so dense they'd break Don Miller's densitometer (ha) but they print well if I expose long enough.