I have the Sunpod 20" 70W MH unit, and wasn't aware of the 150W version when I purchased the 70W. Now, I want the 150. I am thinking that if I got ahold of the same 150 ballast used in these that I could swap my 70w ballast and the bulb out for the 150w and bulb. I did a brief search lookiing for any info on the ballast, or getting ahold of just the ballast, with nothing turning up. Anyone have any ideas? Also, Iposted in the WTB thread that I would like to trade this version for the 150w version- you never know, someone may have the 150 and feel it's too much light for what they need. If I had known of the 150 version ahead of time and the fact that it's only $10 more.