Anyone know the luminosity of UltraSabers' LEDs?

I'm planning on building my own lightsaber, but currently am stuck in the initial stages between two options: cannibalize a high-power LED flashlight for internals or buy one of the cheap UltraSabers and use it as a build-around.

The real sticking point between the two is the brightness achievable in either instance -- any LED flashlight I use has a stated lumen value, but nowhere on the UltraSabers site do they list how bright their LEDs get (and I'd rather not just eyeball it). Anyone got an idea how I can figure this out?