I’m fairly confident in the CCT readings. It looked cooler than any of my 5000K lights. I took several readings, which were consistent, and it’s definitely visibly higher in the highest mode. I wouldn’t be completely shocked if most E75s are 5000K, but a few were 5700K by mistake (i.e. they got a reel of LEDs in the wrong bin).
6060/4=1515mA per emitter
That’s not how boost drivers work. Instead, we have:
6.06A * 4.0V (estimated voltage sag under initial load) = 24.24W
24.24W / 4 = 6.06W per emitter
Now we can find current and voltage values that get us close to 6W from this test by djozz, which gets us 651lm per emitter, or 2604 total.
But we’re not done yet. I took that reading with an ammeter in series. Those add a lot of resistance at higher current and tend to read lower as a result. I’m not entirely sure it’s responsible of me to publish numbers over 2A or so without a clamp meter.
There’s a way to cross-check this: measure current and output at the same time. I dedomed the LEDs at the end of the review, so the numbers are going to be lower (though still very possibly optimistic). I see 3617 lumens with the tailcap on, and 2550 through the ammeter reading right at 6A.
So there we have it: 6A does not represent actual operating conditions. I’ve removed that reading from the table. According to djozz, we would need about 11A for 4000 lumens, though it wouldn’t surprise me if these are a higher flux bin, so maybe 10.
I should probably get a clamp meter… and maybe a calibrated integrating sphere.