Nice setup, good luck with the grow ;)
The UVB lights need to go to up about 20cm to have some effect and people usually add them in flower, no real need for them in veg.
I checked out your last grow! I was wondering why your grow room looked like a giant space bucket! You have a great looking DIY set up. I'll follow along since I'm a graduating bucketeer, and I can learn from your experience.