LF to Surefire output

Just wondering if anyone knows what the lumens difference is between the lumens factory lamps and surefires lamps (what would surefire rate the lamps LF made) in terms of output.
ES-6 80 lm 80 min
SR-6 120 lm 60 min
HO-6 160 lm 50 min
EO-6 200 lm 40 min
what would surefire rate these for Lumens? or is there anyway to tell (calculate) the difference?

Just trying to find out if it is worth it to get the P60 65 lumen 60 min lamp/P61 120 lumen 20 min lamp from surefire, or should i go to lumens factory (which is looking much brighter and cheaper)?

SureFire underrates thier incandescents for more than just optical losses. The output figures they give are more of an average for the life of the batteries. As a general conversion, you can take the LumensFactory output numbers and multiply them by .65 to get an estimate of torch lumens. Don't let that discourage you from using LF lamps. They have a wide variety of rechargable options, and all of their lamps are good quality and, as you've pointed out, well priced. Also, because of the way the reflectors are designed, LF lamps tend to have a tighter hotspot with more throw than comparable SureFire lamps.