Ok, let me see if I can answer my own question. Here is something I found:
http://www.buylightfixtures.com/garage-induction-light-fixture.aspx?gclid=CNXZvdmFoLQCFYp_QgodXX0AUQ
$632 free shipping. Includes a 80w lamp. For ceiling less than 15'. 5000k color (same as what I have).
Is this a valid fixture to use? How many would I need? It uses 80w lamps so more than my dual 32w lamps. Would I need 8? 6?
I currently have 18 T8 fixtures in place. Maybe 300 bucks total for all my lamps.
Show me the cost savings. If I put in 8 of these, that is about 5k plus DIY installation. And that gets 640w of light. Not sure how many lumens.
The T8's are 1160w of power consumed. So 1/2 the juice give or take. Bulbs are 25k hours vs 100k hours. To me that is a wash as I haven't replaced any bulbs in the 4 years they have been up.
So how long to get any kind of return on the investment? Figure 8 hours a day goofing around in the shop. .10 per kilowatt hour (example).
T8 - 18.65 per fixture per year. - 18 fixtures - $335.52 per year
Induction - 23.30 per fixture per year - 8 fixtures - $186.40 per year
$149 per year extra to run the T8's.
So I figure that I will start to get my money back in 33 years give or take.
Did I make any mistakes? Of course some of the figures are random guesses (KWH etc).