Yesterday I attached Reef Brite XHO kits to the Radions. These are gen 4s. I'm only doing this to the 5 fixtures in the front row of lighting. The five Radion fixtures in the back row won't have them. I just wanted to add a little pop with the Reef Brites. I can always add on more if I want to but there is more than adequate light with the 10 fixtures. I also thought upgrading to the gen 5s would be a waste of money at this time.