I attended John Sexton's workshop a couple of years back and he addressed this question while the group was in his darkroom. He recommended an incandescent bulb, and he pointed out that he uses a small-sized soft white flood lamp bulb that is positioned a couple of feet above his reach (near ceiling of his darkroom) in the area where he most commonly examines wet prints while working towards his goal. As far as light level or brightness, he recommended to take your incident light meter and set it for ISO 100, and seek to have the meter measure an EV in the range of 6-to-7 at the level where you will expect to examine your wet prints.
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