Mick that's good stuff with Boondock. He just needed to take it a step further, you can actually calculate the throw of each light and rate them all equally. Very few know what a Lux value is, or understand any of these numbers. But if you can get the distance where each one is the same brightness you're then comparing apples to apples.
Lux varies with distance but you can calculate Candela at 1 meter and then the Throw based on ANSI criteria.
http://flashlightwiki.com/Light_Output_Measurements
.25-1 lux or 1CD is the brightness of a full moon depending on lattitide.
.25 is the ANSI value for throw, I believe you need more than .25CD (at least I do)
I believe .5-1CD is needed for me to shoot but your eyes and optics may vary. I used 1cd when I did the thread below almost 6 years ago. It also makes the calculations easier. It eliminates the throw calculation. You could also substitute any number less than 1 as the denominator in the throw calculation formula .
http://www.predatormastersforums.com/for...726#Post2293726
20 yards is 18.288 meters.
18.288 squared is 334.45
1CD is calculated as the square root of 334.45 x lux value @ 20yards.
I took the brightest light from each MFG and calculated the throw for 1CD
Sniper Hog 66LRX........... 262 CD or 1CD at 262 meters
Wicked 403..................260
Nite Snipe NS550........... 260
Coyote Light............... 237
EWT XLR 250................ 212
Predator Tactics Nightmare. 158
Fox Pro ....................157
I've done my own comparisons and my findings are slightly different
Modded $25 China Zoomlight...167
FoxPro.......................186
Coyote Light.................154
Night Eyes GL300R............140
I was pleasantly surprised by the Fox Pro, not sure why they haven't come out with a gun mounted light
The Coyote Light under performed based on what I had heard and maybe the one I got wasn't fully charged or just a lemon.
Another thing to remember is the numbers on this list for zoom lights are taken when they are fully focused. The LED image projected is smaller than the FOV of your scope. If you back the zoom off to fill the FOV the KCD value and throw will DECREASE
The Night Eyes GL-300R is a reflector based light and the beam will fill the FOV of your scope. While only being 140CD it may be brighter than any of the zoom lights after if they aren't fully focused to fill the FOV of your scope.
I hunted for years with a light that put out 120KCD and when modified 140KCD I could shoot 150-200 yards.