I love flashlights, though I've tapered off (couldn't go cold turkey) in buying every one that caught my attention.
SureFire is SureExpensive and I tend toward the Streamlight alternative. That is for tactical lights.
Nothing as scientific as you but I did a whole little story on various non-tactical lights for survival. I do like the category by battery type on the review page.
I'm trending, as I get older, towards simpler. I don't need fancy stuff like SOS, strobe, red lights. Just a momentary on and a full on is all I want. Though in the camping light, low/med/hi is great for extended battery life.