That said, the S2 seems to be the 'production' emitter of choice at the moment.
Some questions about the tint of the S2 though, apparently it's a bit greenish. Although the doughnut has gone.
http://www.cree.com/led-components-and-modules/products/xlamp :flowers:
Not showing for some reason.
The XP-G S2 is replacing the R5 in several Fenix lights imminently but generally seems to be in the 200-400 lumen bracket, depending on power source.
The XM-L U2 is a larger emitter which is delivering between 500 and 860 lumens, again depending on power source - the new TK35 uses a pair of 18650s to reach 860 lumens.
I'd broadly agree with Roy's assertion that there are different ways of measuring lumens, although it's a matter of pure physics that the lumens 'out the front' will be lower than those stated by the manufacturer for a given power supplied to a given emitter
Fenix are good in that (claim they) quote measured OTF lumens, which seems believable to me because when they switched over to measuring rather than calculating, the lumen output quoted for various lights actually decreased even though they were using newer emitters.
Incidentally, I think we're seeing the first significant jump in emitter output from Cree in the past 18 months or so - the S2 increase compared to the previous R5s is much more than the past two or three incremental increases.
Based on the last couple of years, I suspect we'll see something like an S3 or S4 bin in the next few months bringing another notch up, then another period of stagnation.
Hello again darkness, my old friend...