John,
I have been running Ushio 10,000K 400W bulbs (5 of them) for 18 months and a few weeks ago I mounted a Radium 20,000K right next to one of the 10,000K's. The color is fantastic IMO. I have both the HQI and regular PFO ballasts. The Ushio bulb when driven by the HQI ballast is 20% or so brighter and more blue but still needs 200W or so of actinics to make it blue enough for me. With the 20,000K mounted next to it no actinics are needed (I still run mine anyway for dawn/dusk effect).
HTH,
Kevin



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