JohnnyB:
We have done quite a few ballast retrofit jobs in the past, based on the energy savings calculated.
Our local utilities have run various rebate programs over the years, and the savings were quite substantial.
I didn't read the link you attached, but I believe this is what you were referencing.
Matter of fact, there were a lot of "contractors" that only did "retrofits", and accepted the utility co. rebate as "payment in full" for the work. (We did not)
John
