Great that you ordered the T-Rex.As far as your questions,no you dont need to worry about any other bulbs for uva.The TRex does it all.The only thing you may need is an additional bulb to boost temps but that can simply be an ordinary household white light bulb.There is no need at all to spend any extra money on those expensive basking bulb.Also you may not need the additional heat so there may be no need although I like to add more light so if my temps are ok with just the one MVB bulb then what I do is use one of those ordinary household energy efficient spiral flourescents(non uvb) bulbs for light because they dont emit heat so the temps are not affected.You could use the little zoomed basking bulb if you have it and it gets the desired temp as well either way will work.