I am too lazy to charge my 21700…
4140 lumen… xpl hi 5000k. Battery is around 4.0 v.
I will do another test again this week.
[♛ FreemeGB] Fireflies PL47 Gen II 4*XP-L/ Nichia/ SST20 Hi CRI 21700 Right Angle Flashlight - ENDED
I made a PL47 anduril ramp configuration estimated [stepped] lumen table so i could see theoretical lumen values of ramp ceiling minus n. So eventually 2 clicks will be my normal operating level once i determine highest level it maintains, and the table will give me a basis for estimating what lumen level i am running at. assuming my table is even slightly working
I assumed i start at 150 and i did it in increments of 10. The nichia with a blf user estimated max level of 1800lm (texastoast/skv89). The xpl 5000k blf est max level>4000lm +/- 250 (newlumen/skv89) and the sst 4000k est blf max ~2500lm (komeko)
Obviously, reports are still coming in for lumen estimates so that piece is REALLY ROUGH and turbo seems to be a function of which cell, and only at turn-on, etc. But does my scribble table work? Or is there some wierd curve or slope thing that would render my table completely off, in other words does regulation and magical electronicky stuff inside the light, make a table like this kind of favoring like say a bell curve or something. I think what i show is a linear breakdown of ramp ceiling (or floor if you go the other way). But i dont know the hardcore aspects of how it really works, so i dont know if it holds up. But i wanted to have some foggy sense of what my ceiling lumen level would be once i discover what level seems to hold without dimming. I understand there are many variables like lite temperature, battery level, room temperature and these sorts of things that are not accounted for in this table—but as a rough estimator could this sort of work?
[Edit: i guess my working assumption is that the ramp function is a consistent linear progression like the slope of a pyramid, each step spaced equally from one to the next. As opposed to say the slope of an inground pool, where it (output)is weighted differently at different points on the slope….i guess, and this is way above my paygrade so i cant quite articulate it but i can visualize it, in mathspeak logorithmic/ exponential/ or linearithmic slopes, or some kind of curvey hilly thing vs a straight incliney thing].
So.: to explain the table, for instance, take nichia @~1800 max lumen. 1800=150 on ramp config. Minus 10 presses (140) gives me a theoretical lumen value of 1680. And so on and so forth. Math is 140×1800÷150=1680…130×1800÷150=1560. [Linear] vs 140×1800÷150=1680…(130+/-n)×1800÷150=x. Or ((130×1800)+/-n)÷150=x[curvey]. or something like that, to indicate that each step is not equally spaced from adjacent steps.
[Edit2: and frankly it feels like there are 2 independent pieces to this equation. Spacing as in distance in the ramp one step to the next and secondly, output as a distinct variable independent to the spacing because of driver and such. It would be nice if my simple formula works but it feels more complicated than that.]
I should have paid more attention in math class.
Does this even come close to holding up or am i completely off?
And i guess the follow up if it seems sound could i use the same simple math to figure out levels within a stepped configuration. So floor equals 10 ceiling equals 100 with 3 steps. So for the nichia i arrive at step1 ~120lumen s2 ~660lm s3 ~1200lm.
Any thoughts appreciated.
Received my black neutral XP-L Hi today and after all the negativies I’ve read all over here are my first impressions:
-anodising is flawless (time will tell for how long)
-yes, the supplied headband is crap, but all my other headlamp’s bands seems to work just fine, so no worries
-it feels a bit headheavy, but I guess that’s acceptable too, since it wasn’t intended as a headlamp
-UI seems good and since it’s programmable, it should satisfy most
-the 18650-adapter seems to do its job nicely, since I’m still waiting for my 40T’s to arrive and my only 21700 (Wuben), is about 1 cm too long
-tail magnet is so weak, it won’t hold the lamp anywhere
I’m yet to test it outside, but so far it looks nice. Especially considering the price…
I guess I now can order another FireFlies, I’m just trying to decide will it be another PL47 or the E07…
yes I am happy with mine as well. It has given me the confidence to go ahead and order another fireflies flashlight. Probably the E07
17track still has nothing.
< sigh >
Ordered late October. Jack Zhang confirmed the order 30 October. Shipped 26 November.
A tiny bit frustrating when other people have their lights already.
If a CW fan likes this 4000k, it must be really good. 
Did you take any lumen measurements?
Not a CW fan, I like white, as in completely neutral with no tint in either direction.
The angle head doesn’t fit in the 4 1/4” opening of my light box so the readings from it seem skewed, very low. I tried it on the iJoy 21700, numbers are too low for me to believe so I didn’t even write it down. Seems like it was in the upper 1300’s. And yes, I know to double click for Turbo in Anduril…
I think you need this. And maybe this.
Measure a few known points on the ramp, then mess with the calculator parameters until the curve fits your measurements. Reference values are in Anduril’s cfg-*.h files to get you started.
Does the PL47 Anduril still have 255 steps? I though I read that was default for the UI.
I can say with ramp floor set to lvl 10 on my 219B is NOWHERE near 120 lumens. Probably closer to 2 or 3 at most.
?? I don’t understand what you’re disagreeing with, that is what I expected. I remember posting in one of these threads just after you, saying which batteries give more current, according to HKJ, and it agreed with your observations.
These all agree with what HKJ says, except for the second one, which he didn’t test. Interesting to see it’s really good. I expected the Vapcell 2500 to be a rewrap of the Samsung 25S but HKJ shows it gives significantly less current than the VTC5A, so probably the Vapcell isn’t a rewrap of the 25S.
In the same boat as you. I would say more than a tiny bit frustrating…
Ugh. I cant really make sense of the links. Code is outside my frame of reference. And i do not have a way to measure lumens, hence blf user estimated lumens (peak).
But it sounds like what you are suggesting is there is a weird curvey thing at work. In the code stuff i did see “visually linear”. And arent lumens funny that way, such that twice as bright actually is 4x’s technically bright? Which would suggest an exponential curvey thingy, right?.
So what you seem to be saying is my table doesnt work—which i suspected.
I am not really-math-capable, that formula truthfully exceeds my ability level to begin with. That said, it does seem like if the curve parameters are understood, the peak is given and the number of steps are given one should be able to define those steps with math, right?
Is there anyone out there who can do this?
It’s quite easy. It’s a logarithmic curve following our eyes’ perception of brightness.
I got 150 from the rot66 thread, i think. Post 636 and another one— I have 2 screenshots of guys explaining how to configure ramp. But it is unclear to me the exact source. Both suggested 150 steps, but it is now unclear to me if that is complete steps or regulated steps.
That was what i suspected, but seeing it is the easy part. I think the math part is slightly more complicated, no?
At least more complicated than my tables formula.
[Edit: Ha! easy is relative.]
cclight, you said that the 30T doesn’t give that much more current than other cells, when in fact it yields some 50% more than other 21700’s… at least the one’s I have.
Maybe I misunderstood the context or something. . .
It has 150 ramp steps from moon (level 1) to turbo (level 150).
Internally, this is implemented by using PWM with duty cycles of 0 to 255 on multiple power channels. But as far as the user needs to know, it’s 150 ramp steps following something close to a perceptually-linear curve.
It’s not necessary to understand the code… but if you run it, it can calculate the estimated lumen output for you. It generates tables like yours, and lets the user choose which type of curve shape they want and how bright some of the points along the way should be.
It’s a python script, so it’d need a python interpreter installed. Depending on the OS, this can be a little inconvenient or it could already be installed by default.
Anyway, the links are the script used to calculate the ramp, the parameters sent to the script, and another thing to help determine exactly which of the 150 ramp levels it’ll use in stepped mode. The ramp shape it used wasn’t a logarithmic curve in this case; it used a ninth root instead.
Ha. Thank you. But, maybe someone else with like minded enthusiasm will be able to do that, because i just hugged my knees, started crying and i am now rocking back and forth. I hope to be done crying by friday but we’ll see how it turns out.
Seriously though, that seems about a phd away from my level of typey thing aptitude.
I said it doesn’t give twice the current of other high current cells. This is what your data show. It was in response to someone who asked if it’d be safe to use the 30T in the E07. I said it would be. In the same post I said I’d use the 40T in the PL47, due to heat issues, and the 30T in the E07.
Seems we’re in agreement.