What wattage? I have heard many say that the Ushio 20K and Phoenix 14K are very similar. On my fixture I run 2 150W 14K Phoenix bulbs and mix it with 4 T5s that are half daylight type bulbs and half actinic. This gives me great viewing throughout the photoperiod.
If you are running 250W MHs it is also my understanding that the 14K Phoenix bulb is fantastic. And if I know your fixture correctly it has 4 T5s allowing you to run a mix of ATI Aquablue Specials and Blue Pluses to get the same effect that I have.
My forty breeder with all the lights on-
