Using Boondocks measured lux at a distance of 45 feet (see link):
http://www.boondock-outdoors.com/Light_Ratings.html
I calculated the Candela rating, and the "useful" distance measurement in YARDS based upon a 0.60 lux (a recommended light intensity per Wicked Lights):
RED Light---------------Candela------------0.60 lux distance (yards)
Wicked 402ZF------------46,675------------------305
Sniper 66LR-------------46,100------------------303
Coyote Light------------43,275------------------294
XLR250------------------11,300------------------150
VRL-1-------------------16,000------------------179
Sniper 50LR-------------26,350------------------229
XLR100-------------------6,600------------------115
LightForce Pred9x-------17,000------------------184
Wicked 401ZF------------10,350------------------144
Red Noxx Dagger----------5,650------------------106