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when i used to run MH i ran 400w SE radiums on HQI ballast. the HQI overdrives the bulb a bit and makes it less blue. I really loved the color and growth was really good. i ran a 400w 10K xm SE on a HQI ballast and the color wasnt horrible but growth wasnt THAT much better to make me want to run 10k over 20k. point being is that there wasnt a super noticeable growth difference but there was a color difference. I also ran pheonix 14k SE 250w and it had good color but i wouldnt trade it for the radium.
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