VERY very nice!
All I rad is sweet!
Forgot about the configuration for moon.
WOW, 0.1 - 4000+ lumens
Love all the choices users get!
This sounds really good. Put me down for 2 please.
i purchased one of the original srk’s and it was just a wow light. i use it for camping and anytime i need a serious light. i put a set together for a friend (light+charger-+good quality cells) and he loves it for traveling the country in his fifth wheeler. whenever I am out with my camper i run into an rver that is having trouble backing in his rig at night. the wife is out there with a small dim incan that is pathetic. i offer to put some light on the matter and WOW! all are amazed including “where can i buy a light like that?” I just can not wait to go camping with the Q8, this is going to be orders of magnitude better than the old srk and that was orders of magnitude beyond anything out there.
Good job all and thank you for putting this awesome light together.
ken
Hey guys!
I’m newcomer on this forum, but long(er) time reader.
Nice work on Q8, Please put me down for one please.
I also have couple questions about size of that light, I’ve read almost every post on that thread, but can’t remember whether there was info about light’s (outer) diameter around battery tube.
I had an idea if it would be possible to make it accept 3×26650 and/or possible same time accepting 4×18650 as alternative or just 3x with adapters. Since they are all parallel.
I’m not sure if it possible to make it accept same time 4× 18650, but that was just and idea and probably could done with some kind “carrier” or “sleeve” in same tube if it’s included (I know that wasn’t part of your plans, but if you like that, I’m sure there is people with better planning skills 
) Carrier could also provide more flexibility in terms of modding.
Alternatively it could be sold as “spare” tube also with different drilling’s for different cell’s, if only this light could cope with little bit extra on tube.
I don’t myself own yet any 26650, but I think many of user’s here does and I’m also considering to get some as well as light’s that accepts them.
Hence the light is “soda can” I thought it could actually be little bit bulkier. I measured that my beer can’s are ~65mm in diameter and with 3× 26650 it could be around ~60mm (depending on wall thickness) so still smaller.
I did make little sketchup drawing to get you some idea. It should be in scale. Red’s are 18650’s and Green’s are 26650’s. Please note that Red’s are off center in that drawing.
Please give me your thoughts about that idea and feel free to shoot it down!
Best Regards
Phoenix_FIN
Welcome to BLF!
Cool not only first post and pm about the Q8 (thanks) but also with an idea, great!
I will put 3 26650 cells together and see how these sizes up
The tubes of 4 P 18650 lights is pretty clever designed. The cells have their own space so even when not using 4 they stay nice in their place. I show a pic about that too.
Latest Narsil updates in a new video, just posted: https://www.youtube.com/watch?v=RXgXnsKr2Ps
This is what I posted for it:
June 5th updates in Narsil for the BLF Q8 project. The 3 lights shown have identical firmware showing ramping mode, but the first two (SupFire M2-Z and M6) have a 2.1 sec ramp configured, while the third light (Securitylng 4X clone) has a 2.4 sec ramp configured.
Updates:
- added a 0.37 sec delay in moon mode when ramping from OFF
- double click now works with the light ON
- triple click displays battery voltage reading in blinks
Nice you did it!
That cell status is very cool, and very useful to be able to get to so easy!
I love the UI Tom and I like Phoenix_Fin’s suggestion for 3x26650. I’m planning to get the Convoy L6, L2, and BD06 so if this took 26650 it would be great.
What’s the advantage of 3x26650? I consider the larger diameter as a clear disadvantage, capacity would not be much better either. Please don’t make it larger.
For the 3*26650, it would certainly change everything for the battery tube. 3 26650's needs more width than 4 18650's. A carrier would be needed, and a carrier probably means even more width, more height, more resistance paths, etc. There's also a good reason to stay with 18650's in multi-cell lights - the 18650 has the best density of power for size and weight, and the big 4 make 18650's, and only SONY seem to make 26650's for some reason (Pana/SANYO, Samsung, SONY, LG).
Comparing the top capacity and top performing cells, 18650: 4 * 3500 = 14,000 mAh, 4 * 3000 = 12,000 mAh. For 26650's: 3 * 5200 = 15,600 mAh, 3 * 4200 = 12,600 mAh. 26650's have the slight favor, but 3 26650's would require a larger diameter battery tube, and a 26650 is nearly double the weight of an 18650, but not close to doubling it's capacity. I don't like the tradeoff, though I'm a big fan of 26650's.
With 3x26650 many people would need a handle for this light. My hands are rather large, but still a SRK is the maximum I would like to carry around without handle.
TOM E this UI looks great
is it possible to flash it on other drivers too ?? if yes which do you recommend ??
When we were starting this Q8 I asked in a new topic if anybody knows a flashlight that is sold with a AT85 and no answer
But you need something like the parts list in the OP
AT85, fet and 7138 chip
We would love to see people test Narsil, the more the better!
Well... Of course, but must be a Tiny85. I dunno anyone selling them. I got the firmware running on 17 mm's and 22 mm's, and even one of these SRK 7135 drivers, but swapped the MCU. Best board (I think) is or will be this one: http://www.mtnelectronics.com/index.php?route=product/product&path=67_117&product_id=663, but still need to swap the MCU to a Tiny85. I got a bunch - need to reflow them and test.
Hmm. Is there a pause once you reach MAX before it starts ramping back down? Or does it stop completely? And will have to press and hold switch again to ramp down.
In video, it looks to start ramping down almost immediately making it very hard to stop at the MAX mode.
Honestly, I wouldn’t mind just having it stop all ramping once it reaches MAX. I have a light that stop ramping and a light that ramps back down, and on the light that ramps back down, I always second guess myself if the light is on MAX or slightly less because of the ramping back down.
But if not, I think it should be at the same pause as on the moonlight.
Of course a double click brings it to max right away.
Yet a little extra pause sounds logical, but up to Tom 
Ohhh, no - sorry, was hoping you could hear the clicks - the sounds of the clicks make a big difference. It ramps up to max, then stops there. I was releasing the switch, then doing a press&hold to ramp it back down. Sometimes, usually the first time in the video, I didn't hold ot long enough to hit max, so had to press&hold again to hit it.
It will stop ramping at max when going up, and at the lowest level (moon of PWM value of 3) when ramping down.
Below are the new 150 level, 2.4 second PWM level tables, using TK's utility to generate them. Notice in the FET table, the last 29 values are above 50% (128 and higher), and it gets pretty hard to differentiate anything much above 50%, so it's kind of hard to tell the moment it reaches max. Might be easier outdoors in true low light conditions, not sure. Was thinking of adding a real quick blink at max, just to signal you got there, but that might be distracting too, but would make my testing and videos easier 
.
//---------------------------------------------------------------------------------------
#define RAMP_SIZE 150
#define TURBO_DROP_MIN 115
// min level in ramping the turbo timeout will engage, level 115 = 106 PWM, this is ~43%
#define TURBO_DROP_SET 102
// the level turbo timeout will set, level 102 = 71 PWM, this is ~32%
// Ramping Modes, 150 total entries (2.4 secs)
// level_calc.py 2 128 7135 3 0.3 150 FET 1 1 1500
PROGMEM const byte ramp_7135[] = {
3,3,3,4,4,4,5,5, 6,6,7,8,9,10,11,12,
13,14,15,17,18,20,22,24, 26,28,30,33,35,38,41,44,
47,51,54,58,62,66,70,74, 79,83,88,93,99,104,110,116,
122,128,135,142,149,156,164,172, 180,188,196,205,214,223,233,243, // 49-64
253,255,255,255,255,255,255,255, 255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255, 255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255, 255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255, 255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255, 255,255,255,255,255,255,255,255,
255,255,255,255,255,0 // 145-150
};
PROGMEM const byte ramp_FET[] = {
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, // 49-64
0,2,3,4,5,7,8,9, 11,12,14,15,17,18,20,22,
23,25,27,29,30,32,34,36, 38,40,42,44,47,49,51,53,
56,58,60,63,66,68,71,73, 76,79,82,85,87,90,93,96, // 96-112
100,103,106,109,113,116,119,123, 126,130,134,137,141,145,149,153, // 113-128
157,161,165,169,173,178,182,186, 191,196,200,205,210,214,219,224, // 129-144
229,234,239,244,250,255 // 145-150
};
//---------------------------------------------------------------------------------------
U hit it right on once again haha. I dunno call me lazy or maybe I just forget instinctly about the double click to high.
But when I turn on the light , and say I need more light, I tend to press and hold switch to ramp up more often than doing a double click.
I may just have a lazy thumb hahha
Thanks for greetings!
I think I know what you mean ( I have SRK also), depending on design that could be achieved too.
Thanks for support!
I think advantage would be versatility of cell's by user preference. Of course some might think that too big, but think of having 0,33l soda can in your hand and it would be smaller. If it would be with carrier that would give them ability to make it in series of higher voltage if needed. Please bear in mind that my idea was it being user preferrable between those 2 cells types.
You got nice points there, thanks. And special thanks for your effort in ramping, I really like watching it and look forward seeing it in my hands (with Q8).
I hear you. It is always matter of opinion.
Here is another sketch with little different position of 18650's so they would align different. There is now possibility (blue) for "triangular" shape of tube that could be nicer for hand and also work as antirolling. Downside being it would have to made out of solid bar.
And one more with body tube like, since I realised that there could be fitted 7x 18650 in same place of 3x 26650's (or even little smaller). Here they would certainly outperform.
Thanks for your opinions. And sorry for my "mad" inventions
. I really like all of your effort guys. I'ts not like I would make it my own and force it to be too big (or something you dislike) for you. I'ts just me and my idea's, that sometimes I might be re-inventing wheel. Nevertheless I like to say them out and see if they any good. I really enjoy reading this forum, and watching group buy's where is productive conversations.
Like before feel free to shoot my ideas, I appreciate your feedback.
Best Regards
Phoenix_FIN
Wow! 7x18650? Runtimes would be immense. But that looks like a completely different project. IMHO.