Hello all. I did a search (I really did!) but didn't find what I was looking for, so I thought I'd ask. Considering getting a 600w lumatek ballast and would like to know from anyone who runs one....what bulb do you use? I know people have had compatability issues in the past concerning bulbs and the lumateks. I emailed lumatek a couple of days ago but haven't heard back from them concerning this issue. Any recommendations would surely be appreciated. Thanks alot!