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So, did you buy the light already? Is it the UVR LED bar they are selling? Looking at the pictures with it, that is a really really narrow UV spectrum they are selling. It's between what looks like 365nm and 380nm. I was poking around looking for UV LED fixtures but it seems like everyone only has the higher wavelength UVA currently. The limited research I could find suggested you need a mix of UVA/UVB for good response. I could be wrong and there are definitely guys on here with way more light knowledge than I.
If that spike is so short it probably isn't into a damaging enough wavelength that is can be run for so long. All the lights with UVB suggested just a few minutes per hour. @Mañ'O'Green has a UV fluorescent bulb setup that he runs for a couple hours a day towards the end of flowering. I was kind of surprised at the time/length but he has got it dialed from the obvious results.
I think he is also running a "10k UVA plus" finisher bulb at the same time. If you're thinking of adding UV, and I know that UVR is going to clip to your Gavita nicely, you might be better off investing in a couple of the UV fluorescent bulbs. I bet they will be significantly cheaper and the spectrum looks like it will be "better" than what the LED guys are pushing right now.
Id at least look at the Agromax UV bulbs. A 4' fixture would probably zip tie to that black bar in the middle of your 1700e and then you could use a timer. Either the pure UV that is UV-A/B or the 10k UV-A plus. If I had the space I'd copy some of MOG's setup and run a 4' of the 10k-A on the sides and one Pure UV down the middle.
Price wise I bet that Gavita is $$$$
UV-A/B
UV-A plus
It's only a 30w light so I believe them on being able to run it for 12 hours.
Why You Should Include UV-A In LED Grow Lights
Many growers misunderstand ultraviolet light. They think that it will always hurt their plants. Or, they think that only UV-B is helpful in increasing the medicinal quality of plants. Both those statements are untrue. In this article, we’d like to tell you four reasons you should be growing...
chilledgrowlights.com
CutterAU has a 385-420nm UVA kit with a 100w driver.
I'm curious to whether UVB is actually necessary when running UVA.