Ron, I think you have a very valid point; there is a lot of variation between what is a available. But I think you could start with the "basics" and develop from there. Things like: watts (total and per LED), programmable (yes/no, etc), lens (90, 120 degree, etc), quotes PAR values at 18'', 24'' ,30'', etc, cost.
I don't know if it is possible here to post a shareable spreadsheet that all users could add information, etc?
Vinny - thanks, I'll do some reading.