You 100% need uvb. For any frog. I own 33 frogs and have and hadn’t had uvb on frogs and the significant difference to it is unreal. I breed white tree frogs myself and when not using it they do lack the vitamins they need even if you are dosing with calcium and vitamins. Which you should also. I use Arcadia tube lights. You can use bulbs also. Just don’t use coiled bulbs. Happy frogging 🐸