Ball pythons are nocturnal - that means that they spend their days in a termite mound or rodent burrow during the day (out of direct sunlight, not being exposed to UVB or UVA light). So no - they do not need supplemental lighting.

My permanent collection is kept in racks. Pet store guy sounds like the typical pet store guy who is regurgitating "reptile" information and applying it to all reptiles.