Quoted:
The G2L is pathetic, too weak. The 6PX is much brighter, although I would get the polymer version.
I like the level of light from the G2L for inside applications, especially if I'm responding to something after waking up. I have a surefire E2DL at 200 lumens, and if I turn that on in a room, it causes me to involuntarily squint. The 80 Lumen G2L doesn't do this, but still provides plenty of light.
Outdoor work, it's good out to about 50 yards. I shoot targets at that distance in total darkness, and it works to identify them.
If I needed a dedicated outdoor weaponlight, I would get a Surefire scout light, or maybe just put in a malkoff module. But for indoor use the malkoff is rated higher than my E2DL and the scount lights are the same, and I think it would be too much.