Not sure, but Josh's frogs sells em to. http://www.joshsfrogs.com/zilla-tropical-25-uvb-fluorescent-bulb-18-15-watt.html says something about 25 microwatts per second
Oh dang there's here also, https://www.thecritterdepot.com/collections/habitat-additions/products/open-air-aluminum-screen-cage-free-shipping?variant=31468384026762 little bit more expensive, but seems like they have some in stock when you click on the specific size. Mainly cause it's the deluxe...
Make sure you take out that repti carpet in the enclosure to. It becomes a breeding ground for bacteria. Just leave the bottom bare, makes it easy to just wipe clean when need be.
I recommend pangeareptile also. I ordered my uvb fixture plus 6% Arcadia bulb from them for $65. And that's with standard shipping. Heck of a lot cheaper than buying both things from some other sites.
If you can get you a pothos plant, they usually come in hanging baskets. If you don't want to bother with trying to figure out a way to hang in the enclosure you can set the pothos on the bottom and then tether the vines it has all over the enclosure and on branches with little crafting wire cut...