Upgrading my 175's to 250 HQI's is next on my list. I think I'm going to try out the XM 10K bulbs. If you are looking to try a 250 HQI bulb between 10K and 20K then I think CoralVue makes a 14K bulb, BlueLine makes a 14K bulb, Giesmann makes a 13K and a 14.5K. XM just came out with a 15K 175 watt bulb. Maybe they have plans to introduce some 15K 250 watt bulbs.
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