ItsDave- Well, I don't really feel like spending more money on another timer, but I probably will so that I have my 2x18 fixture turn on at 11:00 AM and my 2x20 watt bulbs at noon. Then I'll have my 2x20 watters go off at 9:00 PM and my 2x18'ers at 10:00 PM. Right now, they all come on a 11:00 AM and go off at 10:00 PM
I really wish they weren't 50/50 and I could turn on actinics first, but that isn't the case. If you have the "same fixture only larger" you probably will have different cords for your daylights and actinics. If so, turn your actinics on 1 hour earlier and off one hour later than your main daylights.