Jetbeam BA20 Lumen rating??????????

I was looking at the BA20 review from light-reviews.com the jetbeam is rated at 270 lumens but the review states that the max output of BA20 is only 219 lumens did the reviewer make a mistake or does it only emit 219 lumens coming out of the lens? Sorry if this is a noob question.

BA20: http://www.jet-beam.com/links/pro/ba20.aspx

Review: http://www.light-reviews.com/jetbeam_ba20/

Just another case of a manufacturer over-stating lumen output... or at least publishing a spec without detail clarification (instantaneous peak, emitter, OTF...etc). If I set the lux meter to read instantaneous peak/burst my Malkoff M60 measures 260-270 Lumens OTF. But we all know this is false, as the M60 measure ~215 OTF steady state.

Most likely they are just republishing the stated drive current lumen value from the XPG datasheet.

There are probably a dozen different legit & honest ways a manufacturer can derive a lumen value.

I could see 219 being a problem, since they're claiming 270 ANSI, but +/-15 isn't bad.

Same experience with my BA10

Although from what I read, it's still brighter than most of the 2xAA XPG lights.