I run 2 250 watt MH's with a Nova Extreme 4 build t5. I've been running an informal test on MH bulbs, on the left side I have a 14k ushio and on the right side I am running a 14k Phoenix. I installed both bulbs about six months ago and so far IMO, the Phoenix is the all around better bulb, for growth and color. I plan on swapping the t5 fixture with LED's for actinic's, when I can afford it.