Eric is right. UVB is not necessary for Pacman frogs. UVB radiation is used by the body to produce vitamin D3 naturally and is not needed as you provide a calcium supplement that contains D3. Vitamin D3 is used by the frog to properly metabolize the calcium into the bones.

They do benefit from 4 to 6 hours of UVB light per day but the bulbs are all fluorescent and are usually too bright for Pacman frogs and can damage their eyes. If you are going tgo use lights for an extra heat source and to provide a day/night cycle use incandescent bulbs combined with a clamp lamp that has a dimmer switch. This way you can accurately control the amount of heat and light produced by the bulb. Always provide some kind of plant cover when using lights whether they be fake or live. This helps the frog feel secure and hind in the shade like they would naturally in the wild.