<a href=showthread.php?s=&postid=9703592#post9703592 target=_blank>Originally posted</a> by T5PO
I have two of the 150w MH electronic ballast, running 20k HQI bulbs no noise and the operating temp marked on the ballast is 156 degrees. I just sit them both on a brick to act as a ceramic heat sink. No problems and when its time to upgrade those are the ballast im going with, not to mention the prices with shipping included.