Yes the numbers at the store are taken off the fenix website.
Think of the numbers as relative, not absolute. So use them to compare the various fenix models to get an idea of how the compare.
The lumen figures are mainly from the luxeon data sheets, like R bin up to X lumens. Now the lights may not drive them at 350ma or whatever drive level, so the lumens may be lower in real life if you factor in drive current, reflector/lens loss, binning ranges, etc.
The E0 5 lumens is pretty accurate it sounds like though, but it could be 1 lumen or so off. We already have a good idea of how many lumens the nichia CS puts out, and surely it's getting at least 20ma, where as the luxeon single AA lights aren't running at full 350ma I imagine.
The 2 cell models likely are closer or at/above 350ma because they have more input voltage and the driver has more to work with.
If you look at other lights like say the QIII with a lux3 and think wow, lux 3 it's gotta be at least S bin, 60 or so lumens, then fire up a L1P and the L1P with 1w is just as bright, what does that tell you? QIII isn't driven at lux3 levels even though it has a lux3, so don't expect full lux3 performance figure from the lumileds data sheet! So don't think the fenix lights won't be that bright either.
