I bought a few things from them, never had an issue.

Actually, lumens and candlepower *can* be directly compared. I just found the formula: 1 lm = 1 cd·sr = 1 lx·m2

Hmm...candlepower is the brightness of the light source from any single point of view -- it's not a measurement of the total amount of light emitted, just its brightness at any spot on a sphere surrounding the light source. So the candlepower of a light source is the derivative of the total amount of light emitted.

A light source emitting light at a rate of 1 candlepower **in all directions** = A light source emitting light at a rate of 4pi lumens. If you block off part of the light source with a *nonreflective surface*, the number of lumens drops because the light in some directions is getting absorbed. But with a flashlight that has a reflector, most of the blocked light gets redirected instead of absorbed, so the lumens should still roughly equal the candlepower * 4pi.

If that's correct, then that means the ASP Tac-Lite has a brightness of 87964 lumens within the cone of illumination. Hmm...that's really fucking bright, if I did the math correctly.

Last edited: Jan 20, 2009