Sorry for the late response, Lloyd, I appreciate your earlier input.
I actually had them in for just under a week when I started the thread, but it was a bit early for me to really have any review for the bulbs. I feel as though they really do have something to them, the traps on my Low Giant flytrap (purchased as a tissue culture and received in January) jumped in size about 70%. Until that point, each new trap was only about 10-20% bigger than the one or two before it, which is still great. But I'd left town for the weekend when they forming trap was at its expected size, and when I returned it had nearly doubled itself before opening.
Since then, it's made a couple more traps, each of which are notably larger than the average increase that they'd been seeing prior to the PowerVeg. I've noticed wider leaves on the Maroon Monster that grow upright (with slightly diminished red colouration, given the sacrifice of the red wavelengths), and my still-tiny Phalanx's have seen a bit of a jump, too, although they're still a bit small for the changes to be incredibly noticeable. Gotta love the teeth on them, though.
Growth does feel a bit slower for new traps when they come out of the ground (on the Low Giant, it's my favourite one and the one I track most intensively, haha), but this could be because it's digesting three meals at present (which is about a third of its traps). But once the leaves get to the point where the trap starts unfolding, they grows very quickly.
So, in conclusion, I've seen a big jump in plant robustness since installing the PowerVeg bulbs. I'd also recently placed them in a humidity dome, as my apartment does get a bit dry and I was going through so much distilled water so quickly to run the small humidifier near them. So while there are other contributing factors, I'm sure, there must be some validity to the bulbs for me to see such a jump forward in average growth-increase per trap/leaf.
Also, the UV is legitimate. It sun-stained the roof of the humidity dome, whomp whomp. I pulled the fixture a little further away in the hopes it won't stain the new one (but I'm sure it will).
I'll give you another update if there are any changes in the future that make me reconsider/revoke my positive review.
Here's some pictures:
This one best shows the size of the first trap on the Low Giant after the PowerVeg installation, compared to one of the traps that grew just before it (the right side of the rosette).
Here's another one at a slightly different angle. The trap in the back left just opening is also post-powerveg.
Lastly, here's one of my maroon monsters:
I'll upload some pictures of the Phalanx when they get a bit bigger. Not only are the traps still tiny in comparison to the Low Giant, but the leaves on the cultivar barely exit the ground before they focus on and open the trap. It'll look amazing when it's mature.
Sorry if this post was super advertisey, I'm just curious to try different T5HOs, and spread the word on them. I'm picking up a couple Actinic Blue bulbs by Geisemann to try, too. Someday in the future I'll write a little review for those, too. And as I said, I'll continue to monitor the effects I see from the PowerVeg.
Edit/Add: All my traps so far, in my new and small collection, were purchased in January as tiny tissue cultures from Flytrapstore, from Matt.