Hi @Simon_Mao , when do You expect to test the M21K+F150R combo? Highly interested 
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@PhantomPhoton may tell us more in a week or two…
You can try it yourself, buy the SFT-90 version and ask for a swap to F150R, that’s what Simon told other people to do if they wanted to try the new emitter before he adds it to the list. But ask Simon first.
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I have updated the options.
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Yeah, I know, the message I replied to said exactly that ^^. Was just waiting for confirmation from Simon the two work together well enough
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Perfect, I see it :). One more question/request - is it possible to enable the LINKDATA INR21700S-65P cell as an option for the M21K as well?
Ahh sorry I completely missed the fact that you fitted the model with both emitter samples! It’s satisfying to see that the reciprocal decay fits the average a bit better, as it’s more physically sensible than exponential decay. Neither really captures the mode of failure after peak output is attained, but that’s ok as LEDs aren’t meant to be driven that hard.
I wish there’s some sort of emitter test data repository in csv format to test these models on. A good model should have, for each emitter, (i) good fitment across the entire test range up to maximum attained output, and (ii) high prediction accuracy at high power given data at low power. I suppose (ii) implies (i).
My M21K has left the factory and is in the hands of the customs shipping gods. I’ll do a report after dark as soon as it lands on my doorstep.
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@Simon_Mao Any Updates on Spectral or light quality Messurmenst for the F150R?
They’re out of stock unfortunately
They were in stock when I wrote it ^^. Either that or I didn’t refresh the product page 
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Simon has less than 100 of them so it makes sense they run out.
@Simon_Mao
Seeing, that the 3X21D is now available with the F150R ans the SBT90.2 - is there a chance to get a lux measurement between the two models so we can have an idea, what to expect?
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I have sent several flashlights to professional reviewers, and the related review information will be published online soon.
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Yeah!
Also:
The airplane carrying my M21K has left China.
I think the flashlight will probably arrive before my Opple light master via Amazon.
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If you didn’t mod it the L8 comes with 25A driver.
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Oh, so that’s why it was freaking hot 
. It’s probably like scaled down 3x21 series driver. And there is no SFT-90X to choose to.
Lol I just saw it had buck and F150R so I ordered it, week ago. 6 days delivery and rerouted parcel machine.
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This is probably the 14500 size, with a T7 PWM driver.