A while back I customized some of these to run 220v with a custom spectrum. Still got them and a storm controller collecting dust because I have no basement 220 in the new houseI have 2 165w over my 75, I am running them at 100 blue and have 1 white for a few hours a day. That white is strong! I think I read the 300 have a higher blue ratio. I'm thinking of getting a LED bar light to add to the front to increase blue and decrease shadowing.