so i recently acquired 48" uvb tube fluorescent light bulbs. i currently have 36" but they are nearing their 6 month mark so i figured I'll use the larger ones. I've already bought the expensive fixture to hold the 36" and i don't want to have to buy the larger fixture. i do own a 48" fluorescent black light fixture that the bulbs fit. my question is can i use any fluorescent fixture for these bulbs? or what specifications do i need?