Yea the veg lights are all you need for the Veg period 100%. I am on my second grow now with the 2000w Phlizon and in the same tent size, and I found the first time I had it to low and also I stopped weaving the plant into my SCROG to early I should have kept tucking for another week. But the specs say that the sweat spot is like 38" or something hell no... I strapped it right to the roof of my tent and the girls are loving it.
The trick is with flowering is you want to try to double your light so once you flip to 12/12 and start your flower period you run the COBS and veg lighting.
Feel free to message me if you need any other help. I have DWC err RDWC hydroponics and dirt too. So yea good luck.