An ambush hunter that avoids the sun on purpose
The pacman frog's whole life strategy is the opposite of basking. In the grasslands and forest edges of South America it digs itself backward into damp soil and leaf litter until only its eyes and the top of its enormous head break the surface, then it sits there — for days if needed — waiting for prey to wander within range of a lightning lunge. Daylight hours are spent hidden from the sun entirely, and the frog emerges to move and feed at night. An animal built this way has no basking behavior for UVB to support: there is no point in its natural day when it sits exposed under strong light absorbing rays.
Where its vitamin D3 actually comes from
Like the other nocturnal hunters, the pacman frog takes the dietary road. Whole prey items carry D3 in their tissues, and the insects and other foods it is offered in captivity are dusted with a calcium-and-D3 supplement powder before feeding, so the vitamin arrives with the meal. That makes the dusting discipline the real health lever for this species — far more than any lamp. A pacman frog fed a varied rotation of properly dusted prey, kept at the right temperature in moist substrate, has its D3 needs fully covered by the same method its wild relatives use when they swallow whole animals under cover of darkness.
Why light can be a problem rather than a perk
For a burrower, bright light is not neutral. A pacman frog that cannot escape illumination will sit exposed and stressed, may refuse food, and spends energy on a problem its enclosure should never have posed. The caution sharpens with the pale albino and light-colored morphs popular in the hobby: lacking the pigment that shields skin and eyes, these frogs are genuinely light-sensitive, and strong lighting over an albino's tank is a welfare mistake, not an upgrade. Any lamp fitted for the plants' sake or for viewing should be gentle, run on limited hours, and paired with substrate deep enough for the frog to submerge its whole body and leaf litter or a hide that gives it true darkness on demand.
What to spend the effort on instead
The pacman frog's real care list is unglamorous: substrate kept damp like a wrung-out sponge and deep enough to bury in; clean, shallow water it can soak in without struggling; warm, stable temperatures; food items sized sensibly and dusted faithfully; and a keeper who resists handling, since this frog's skin is delicate and its temperament is to bite first at anything that grabs it. A frog that stops burying itself, sits exposed for long stretches, develops skin that looks dry or irritated, or loses its ambush enthusiasm at feeding time is telling you something is off in that list — and a vet with amphibian experience is the right next step if basic corrections do not restore it.
Ask before you fit equipment this species never asked for
Pacman frogs suffer more from well-meant extras than from neglect of lighting catalogues, and the surest habit a new keeper can build is checking a species' actual needs before buying the fitting. Put a follow-up question to KinsLe's Kimmy about a lamp, a mister or a bigger tank; she answers using the KinsLe Answers library.