RE: 110watts 50/50 vs 110watts anctinic
You are going to lose a lot of light intensity by going to actinic only. On the other hand I don't really like 50/50 bulbs either. The actinic in a 50/50 bulb isn't usually true actinic, its a blue bulb (460 nm) not 420 nm which is true actinic. I would recommend you check the spectrum of your bulbs. 420 nm is thought to cause the color pigments in corals. I guess it really depends on what corals you have in your tank. It probably won't matter if they are just softies. It would matter a lot more if you had SPS. PCs aren't really a good choice for SPS anyway.
Gary
125 SPS, 75 gal. LPS/softie reef, 9 gal. Nano