Whats the best 10k bulb?

[blue20051]

Im using a magnetic ballast and whats the best 10k bulb? I have a SPS dominant tank and would like to get my frags to grow faster.

TIA

 

[JGross4]

XM 10k, Has Highest PAR for 10k I believe, if we're talking 250 watt.

 

[blue20051]

I should of mention that im running 2-250 watts .

 

[MikeD]

Is that a pretty white light or is there some yellow to it? I've been using phoenix 14k but was thinking if I did go to 10k, it would have to be a crisp white.

 

[blue20051]

Im hoping the bulb will be crisp white but im not sure since im using a magnetic ballast.