Yeah, that's the kind of thing I'm talking about. I also did a few searches and saw some of the methodology followed by various test groups where they did exactly as talked about -- like what you did and like here:

Welcome to the MTBR.com Lights Shine-Off!

I think I can set up something workable in my driveway, actually. It's a long enough drive and a large garage at the end -- so, if I set up at a couple of different distances with a recognizable object or two in the light's path (besides just the garage) I should be able to do a reasonable test.

And I can probably also scrape up a tripod somewhere amongst my regular camera gear (and a cable release, etc.)...