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Hellolights.com has a 175watt XM bulb that is listed as 20k.
I haven't tried it, so can't comment on it's quality.

Dan
 

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DKKA said:
Hellolights.com has a 175watt XM bulb that is listed as 20k.
I haven't tried it, so can't comment on it's quality.

Dan
Thats not a Radium bulb is it?
 

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I've run a 250W Radium and a 400W Radium side by side on my prop tanks. Both were run on electronic ballasts. The 250W Radium was much bluer, and had very low intensity to the human eye. I wouldn't run the 250's on an SPS tank unless it was to supplement something else like a 10,000K bulb or an Iwasaki.
 
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