Based on the 'Is the M6 worth it?' thread, where I reminded the poster of the M6's amazing ratio of Lumens per pound, I took a few minutes to whip up a quick chart of where other Surefire lights land on this spectrum, using Surefire's quoted weights for the light with batteries. A few surprises for me, at least. Clearly, this doesn't address, form factor, beam shape, quality, throw, runtime, or a variety of other critical factors, but it provided me with a nice basis of objective comparison. Scroll down to the bottom for a Maglite shocker.
M6 - 15.6oz
HOLA - 500 Lumens = 510 lumens/lb
LOLA - 250 Lumens = 255 lumens/lb
M4 - 11.4oz
HOLA - 350 Lumens = 491 lumens/lb
LOLA - 250 Lumens = 290 lumens/lb
M3T - 9.6oz
HOLA - 225 Lumens = 374 lumens/lb
LOLA - 125 Lumens = 208 lumens/lb
M3 - 7.0oz
HOLA - 225 Lumens = 514 lumens/lb
LOLA - 125 Lumens = 285 lumens/lb
C3 - 6.6oz
HOLA - 200 Lumens = 484 lumens/lb
LOLA - 120 Lumens = 290 lumens/lb
M2 - 6.3oz
HOLA - 120 Lumens = 303 lumens/lb
LOLA - 65 Lumens = 165 lumens/lb
G2 - 4.1oz
HOLA - 120 Lumens = 468 lumens/lb
LOLA - 65 Lumens = 253 lumens/lb
Z2 - 5.1oz
HOLA - 120 Lumens = 376 lumens/lb
LOLA - 65 Lumens = 203 lumens/lb
E2e - 3.2oz
60 Lumens = 300 lumens/lb
L4 - 3.5 oz
65 Lumens = 297 lumens/lb
And for comparison...
Arc LSH-P w/clickie - 2.2oz
22 Lumens = 159 lumens/lb
Maglite 2D 23.8oz
18 lumens - 12 lumens/lb
M6 - 15.6oz
HOLA - 500 Lumens = 510 lumens/lb
LOLA - 250 Lumens = 255 lumens/lb
M4 - 11.4oz
HOLA - 350 Lumens = 491 lumens/lb
LOLA - 250 Lumens = 290 lumens/lb
M3T - 9.6oz
HOLA - 225 Lumens = 374 lumens/lb
LOLA - 125 Lumens = 208 lumens/lb
M3 - 7.0oz
HOLA - 225 Lumens = 514 lumens/lb
LOLA - 125 Lumens = 285 lumens/lb
C3 - 6.6oz
HOLA - 200 Lumens = 484 lumens/lb
LOLA - 120 Lumens = 290 lumens/lb
M2 - 6.3oz
HOLA - 120 Lumens = 303 lumens/lb
LOLA - 65 Lumens = 165 lumens/lb
G2 - 4.1oz
HOLA - 120 Lumens = 468 lumens/lb
LOLA - 65 Lumens = 253 lumens/lb
Z2 - 5.1oz
HOLA - 120 Lumens = 376 lumens/lb
LOLA - 65 Lumens = 203 lumens/lb
E2e - 3.2oz
60 Lumens = 300 lumens/lb
L4 - 3.5 oz
65 Lumens = 297 lumens/lb
And for comparison...
Arc LSH-P w/clickie - 2.2oz
22 Lumens = 159 lumens/lb
Maglite 2D 23.8oz
18 lumens - 12 lumens/lb