aaaand..UV bulb question

[maroongrad]

Black racers are generally found out in sunny fields and similar. Because she's inside instead of out in the sunlight, I got her a UV bulb. Does she need it, or is this just a waste of electricity and an annoyance for her? I had no idea that not all reptiles needed it; I figured that, just like other animals, they'd need sunlight or a substitute for Vitamin D production and overall health. Is this just an extra cord, or is it something she'd need?