The store employee is just doing his/her stuff and trying to sell you two bulbs ! WTFs are nocturnal and like most frogs (even many diurnals) do not need UVA or UVB. Do remember to give it supplements CA/D3 2X and vitamins 1X weekly on different days with skip day in between. Other than heat bulb, can use a blue or day bulb for observation, or bulbs for plant's if have them. Good luck !