I found that site also and a lot of good info. You could make a hobby of just reading that site like you can this one.
I did find some great info on batteries on one of the forum sections. That is very valuable info. Helped me pick what batteries to get for the best run times. I then compared prices to find most bang for the buck. I just ordered 12 pack of Surefire CR123A's for less than $2 each shipped and dated within this year. You have to watch the dates with some sellers.
I also found the info I wanted on the Eagletec D25LC2 clicky. So I ordered one. I really wanted The Fenix PD32, but just couldn't make the jump to the ultimate for the neutral light. I think the Fenix has the best lumen levels for me, but I am trying to stay in my budget as best as possible.
My new Eagletec light will be my first intro into the small high output multi function lights. Specs are as follows:
EagleTac D25LC2 Clicky XM-L2 T6 Neutral White powered by 2xCR123, 2xET/RCR123, or 1x18650 Li-ion Rechargeable. It will be a more floody tracking and work light.
I finally found a place that listed all the possible light levels I can get for a light close to this one, but I am guessing a little. I think the number are something like this.
lumen levels
580/385/100/49/17/6
Run times
1/1.8/7.5/15/25/100+ hours on 2xcr123A
Run times are better yet on the rechargeable 18650, but I am gong to wait and see if that is really needed for the light levels I use for tracking and how fast I use up the CR123A's.
I am going to start of with this light to get a base line for comparison of all the light info statistics that, at this time, are hard to grasp without something for a base line. Stuff like Lumens, throw, flood, color temp, and lux.
If the new light doesn't quite do what I want, at least I will have a good light to use and a basis for picking what I need. If this one works out well for what I need, I plan to pick up a small light with more throw distance and a cooler light for general use. Something smaller diameter and shorter like the Eagletec twisty D25C2.