None of those snakes need fancy UV lights...and if you're using bulbs for heating, just ordinary incandescent bulbs work fine...white for day, black or
red if you need warmth at night. I'm sure you know that corn snakes like (& need) it much cooler than BPs? I don't use lights on my corn snakes at
all, but all have controlled UTH for heat at one end of their tanks. I do use red/black bulbs to add warmth for my small Aussie spotted python...she
loves to bask on her driftwood all night and likes the warmth too...she's spoiled rotten. Anyway, her cage temps are more like what your BPs
need, and if you don't want the added light, you can always use CHE's. I'll just add that since heat rises, using bulbs of any kind as the sole source of
heat for our snakes is anything but "efficient", but I have some "spoiled" rat snakes (Trans Pecos & Florida yellows) that enjoy night-basking too when
it's colder (winter). That's really optional though, I reserve the right to be a chump...