135 lm/w was calculated by Maukka. I dont know how it was calculated
Do you have the link or reference? I’d like to see at what setting this was done on as I am curious myself 
Thanks
It’s in the link in my post above.
OK, so I did a little digging and this is what I see.
The Olight H2R tested 135 L / W at 600 lumens, which is impressive.
The Cree XHP50.2 4000K highest bin 70 CRI is rated at 1328 Lumens at 25C.
The Cree XHP50.2 4000K highest bin 90 CRI is rated at 1073 Lumens at 25C.
That makes the low CRI version about 24% more efficient than the High CRI. This can go up to 30% if the lower bin High CRI was used.
If we were to add 24% efficiency to the Zebralight at 89 L/W, it would translate to 110 L/W at the 410 Lumen level.
The math is oversimplified, but we can probably assume that the Olight is most likely more efficient than the Zebralight in the 400-600 lumen range.
From what I recall reading in old forum posts, the Zebralights are not as efficient in the higher settings, but are tuned to perform better in the lower and medium settings. Not sure how true that is, but it may be possible.
Great to see that Olight is releasing lights that are that efficient nonetheless.
Yea the H2R is really good. The unit I have has amazing 4000K tint to boot (–0.006 DUV at turbo and –0.003 at top of ramp) but that’s sadly the only Olight with good NW tint in existence.
Olight efficiency is getting even better now. The only 2 brands that provide runtime curves or specify step down points are Fenix and Olight so I’ve been studying their flashlight specs and comparing them with run time curves of other lights from flashlight reviewers. These two brands are really impressive in their super high efficiency compared to the rest. I just wish they provide better emitter options. Until then, there’s good reason to buy Zebralight and Armytek over Olight and Feix.
It was calculated by dividing the integral of lumens over time (lumen*hour) by the total battery energy (Wh).
lm/W = (lm*h)/(W*h)
Maukka compared just some flashlights with different LEDs and its just fact about run time in high mode , but not about efficiency.
Lumens / watt = efficiency. Not sure how you can say it is not. Take a look at the links to Maukka’s posts. Also please take a look at Maukka’s comment just above yours on how he calculates efficiency.
My Zebralight H604c does very strange things
