Ah, that’s interesting. I just fused the ATtiny mentioned above to 9.6 Mhz and the pwm frequency reading is now very accurate. I guess I can’t read the calibration value from Attiny program code?
Great review! Thanks.
I love this tiny high cri quad copper head!
Yes, the turbo lumens at power on are in one of the runtime graphs:
For the 18650, the numbers are 1364 lumens at 0 sec and 1175 lm at 30 sec.
That’s professional maukka! Thanks you! 
Wow! Really awesome info. Thanks for all the effort you put into this.
I verified the light pwm. The pwm frequency is 17,2 kHz on all modes other than moonlight which is 8,6 kHz. Thanks for your tip!
Thanks
Ah 
Very nice for the start :partying_face:
Excellent info. Thank you maukka :THUMBS-UP:
Awesome review! I was searching for over discharge protection and your review answered my question!
Just purchased a pair of Samsung 30Q cells for this light i received yesterday, was wondering if anybody is using this battery along S41? Read on some post that 30Q provides too much Amp for this light and it will over heat very quickly. Any chance of the 30Q damaging it?
I read this at least 10 times. Thank you for your excellent reviews. How many amps is it pulling with 18350, and how many with 18650?
Does anyone know if the S41 has fixed the green tint leds, and the shorting problems?
I am new here. Great review above, I ordered one based off the recommendations. I have one issue with mine, my 18650’s were dead and all I had was the extender tube and two 18350’s so i inserted them and I am afraid I murdered my light… Is there any way of repairing the over voltage the light had from my neglect and lack of knowledge? Or should I cut my losses and just order a new one. It was the nichia version. Thanks in advance!!!
you can buy a replacement driver here
but firtst check if the LEDs are still intact
http://www.mtnelectronics.com/index.php?route=product/product&path=60_94&product_id=740
you can use a 18650 cell and connect it directly to the LED board to see if ther LEDs are fried or not
Thanks for the info!!! I will test the components and see what need to be ordered!
I deeply enjoy reading your reviews. Thanks for this one also.
Great review. I use the same batteries in mine and I couldn’t be happier with the tint and performance.
Bob
Thanks for your review, does the Astrolux s41 use same Nichia led as the BLF-348?
I’m looking for a flashlight using the same emitter as BLF-348 but with higher output, i have Nichia 219C but don’t happy with its tint.
There has been some variation on the emitters used in the S41 (and S41S). I haven’t seen any of them with the pinkish tint found in the BLF-348, but do have a couple of excellent neutral ones. It’s a bit of a lottery though, so maybe order two and hope for the best.
Eagletac does have a great higher output Nichia flashlights, the MX25L3C.
For these types of questions, the Parametrek search engine is great, even though it doesn’t cover every possible manufacturer.
http://flashlights.parametrek.com/index.html?led=Nichia%20219B
Wow the MX25L3C has Nichia 4500k which is very rare now but its price is too high for me, it seems that every manufacturers are now switching to newer 219C