Lux at one meter or, more properly, candela is the measure of the light in one direction in lumens per square meter. Total lumen output is the just that, the total output of the light. Some light manufacturers post the lumens of the finished assembly, measured in an integrating sphere while others advertise the total lumen output of the lamp, a significant percentage of which doesn't come out the front of the flashlight.
Go to
http://www.flashlightreviews.com and while he doesn't measure lumens, he measures a propietary unit he calls "qups" and they are somewhat related to lumens, but done in a more home-brew analyzer.
His graphs of peak output (lux) vs total output (qups) are very interesting.
And yes, 13,000 candela is a heck of a lot of light from a flashlight. Oh and candlepower and candela mean the same thing -- but don't be misled with some claims.
There is a more detailed discussion of all this in the lighting handbook I have referenced on my Web site.
Cheers,
Richard