This is becoming a great post and debate . We learn so much from data sharing and research .

We have to remember that in nature amphibians can control the amount of UV light they are exposed to by moving their locations. In a vivarium or riparium, they are trapped with what we provide. For this reason we should also provide shade and shelter from any UV lighting, whether A or B. Medically, too much of a good thing can also be bad....burns, cancers, dehydration, electrolyte imbalances, alterations in kidney function due to dehyd/electrolyte imbalances, etc.

Here is some data on vivarium lighting provided by New England Herp. Just an explanation of the lights, their lumens and wattage and ranges of UVA and UVB lighting. (See below)

Most tropical plants like full spectrum lighting of around 6500-6700K. I use plants such as pothos, philodendrons and Chinese evergreens, which can tolerate less lighting, the higher humidities, and have broader leaves for tree frogs to perch on. I "feed" the plants with the frog poo/wastes by pushing the feces under the top layers of the ABG mix and coconut fiber substrate. I occasionally dump the frog water bowl water into the plant pots. There are springtails in the plant soil to help keep the wastes in balance and to keep away mold as the feces break down. Light, food/nitrogen, and water provide some of the essentials for the plants. Phosphorus is limited for the plants due to calcium exchange in the frogs. I provide shade for the frogs by limiting the height of the plant growth, and by using broader leafed plants. The combo works nicely. The lighting is only on one side of the tank. The plants extend to both sides of the tank. The light is somewhat blocked by the clear cellophane covering over the top of the tank. So, the amount of UV lighting able to pass through is not quantitative or qualitative with this set-up, unfortunately. It's a very simple set-up. Either way, it's enough to keep the plants growing well and the leaves grow large and nice and green , and the variegations in the evergreens are a lovely red/pink. Happy plants = happy frogs .

http://www.neherpetoculture.com/vivariumlighting101

I like this article. Let me know what you think.

Also, a few of the available reptile/amphibian bulbs have UVB and UVA lighting. Most often there is a chart on the back of the bulb packaging showing the levels and how much UV is emitted by height levels away from the bulb.