PFO TAR and PULSE ballasts should both run XM bulbs. I've been running an XM 10K bulb off a PFO TAR ballast(I think this is a probe start?) for almost 9 months and its working great, I love it. I plan to try out a 15K bulb as my next bulb.
Hope this helps,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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