Recommend best SE bulb

I'm still using the 250watt XM 10k's on a PFO dual 250watt HQI ballast. For the first 7 months the lamps are bright white and REALLY bright. After that, they become a little yellow. I use 4 110watt VHO actinics along with them. I wouldn't mind switching to another bulb if it were the same intensity.
 
Here is a picture of my 46 bowfront with 1x250w reeflux 12k SE no actinics.
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