Fireflies ROT66 Flashlight

It does look quite bright but honestly the floody LEDs really show off at this short distance. 7k vs 10k lumens is not much difference really and especially since the HI is more focused it’s probably just the extra 3k all in the middle where it’s already too bright in the middle for the camera.

Awesome comparison Charles Lin!

So if you had to only choose one ROT66, would you go with the XPL HI or the Nichia?

The Q8 is a wonderful light for the money and demonstrates its better reach in that picture quite well.

Very nice! What do you think of the champagne color? I could see myself loving it or hating it, but can’t decide from the pictures.

My MF01 is running Lexel FET driver with NarsilM v1.2, it should output around 9000~10000 lm.
The best output munber I can get from ROT66 XP-L hi is 7480lm @ 0 second & 6650lm@30 seconds with VTC5A.

I personally prefer Nichia. very nice tint & it is only stock high output light use Nichia 219b R0908 as far I know. XPL HI runs very hot in turbo mode for only about 30~40 seconds.

I’ll do it.

It is personal preference. I like the champagne color because it stand out against all the other dark color lights.

I’m surprised your MF01 look that much brighter than the ROT66 and even more surprised that it is so much more on the rosy side of the BBL than even the Cree 3A. I have two MF01, one stock and one with Lexel’s buck driver. The 219C tint on both is on the greenish side of the BBL. One is significantly greener than the other.

The MF01 renders colors the best in your comparison. I think you won the tint lottery with the 219C.

Does this concur with the the notes I quoted from the Q8 (FET+1)? I can’t really tell.

That first step down looks a bit larger than 100% to 55. Maybe more like 100 to 35%? Does that seem correct?

Sorry, all that code looks Greek to me. Lol. So does it look like the ROT66 is using their own tweaked version of NarsilM v1.2?

Is this correct? In mode 4:
Level 1 is set to 100% of channel 1.
Level 2 is set to 100% of channel 1 and 2.
Level 3 is set to 100% of channel 1, 2 and 50% of the FET.
Level 4 is set to 100% of channel 1, 2 and the FET.

This kind of makes sense to me. I hope it’s correct.

I believe the spacing in brightness levels will vary between the 219C and the xpl due to the Nichia version using 7 x 7135 and the Cree version using 14 x 7135. Is this correct?

Do you know how to set your own temperature limit? Here is a link to a video I made showing how to do it. Make sure to start with a room temp light inside and out.

I’m sorta glad that the 700ish lumen mode will probably be the one I use most, because it will be less rosy compared to the max. Those 9080 nichias driven to their limit are pretty damn pink. Although I might think differently once I get mine.

The driver and configurations on ROT66 (FET+1+6, 3 channels) is different from Q8 (FET+1, 2 channels), so sometimes you cannot simply apply what you observed from Q8 to ROT66. The thermal step-down in ramping in original NarsilM periodically checks if the temperature limit is exceeded, and if yes, it will reduce 1/6 = ~16.7% of the current output level (output levels are not guaranteed to be linear though). And the lower bound of this step-down is the max of the 7135s, i.e., on ROT66 it is (1 + 6) = 7 x 7135. That’s why I said “step-down to the highest regulated brightness level”.

The default mode-sets defined in the code Lexel posted are slightly different from the original NarsilM v1.2, so they did tweak something, and I wish they could release that modified version (they should, for license compliance).

The code from Lexel:


PROGMEM const byte mode7135Set4 = { 25, 255, 255, 0};
PROGMEM const byte mode7135sSet4 ={ 0, 0, 255, 0};
PROGMEM const byte modeFetSet4 = { 0, 0, 0, 255};

Put them in a table:
table(table#posts).
|Channel| #1 (7135 x1)| #2 (7135 x6)| #3 (FET)|
|Level #1|25|0|0|
|Level #2|255|0|0|
|Level #3|255|255|0|
|Level #4|0|0|255|

255 means 100% output of a channel. 25 means 25/255 = ~10% output of that channel. Hope this is much clearer.

Sorry, I have no idea how many 7135s are used in the XP-L HI ROT66.

The Nichia version is using 7 and the Cree version is using 14 according to Lexel.

Okay so I think I’m getting it.

Level 1 is set to 10% of channel 1.
Level 2 is set to 100% of channel 1.
Level 3 is set to 100% of channel 1 and channel 2.
Level 4 is set to 100% of the FET (channel 3).

That’s correct?

Doesn’t the highest level in other versions of NarsilM add the 7135 channels to the FET? In this version it turns them off and uses only the FET?

No.

When all 3 channels are at 100%, the output is actually a bit lower than the FET by itself. So for the very highest level, most lights run FET-only. The 7135 chips would only drag it down.

Tom and I got a copy of the code today. It’ll be up soon.

Okay, I must be remembering it wrong. Thanks.

Here’s the output behavior on a scope. Gif from low to max FET. Horizontal lines are 100% 1x7135 and (1+6)x7135. The latter is almost impossible to activate on ramp mode so had to swap to mode config for that, but the 1x7135 I managed to do a couple of times.

Interesting. 7 x 7135 on the Nichia is right on the spot, the max temperature is ~43C in my runtime test. Curious about the brightness and stabilized temperature when 14 x 7135 are installed for the Cree version.

Exactly.

Sounds good, looking forward to it. :smiley:

That’s fairly clear to demonstrate how the modes are achieved. Well done, maukka :+1:

For me, nope. For us non EE, it’s just squiggly lines. Lol

Just like in the code shared previously, you can visually see that the low levels PWM between zero and 1x7135 at 16 kHz. 100% 1x7135 is of course without PWM. Mid modes above the single 7135 are PWM’d between that and the 6x7135 channel at 16 kHz. (1+6)x7135 is again without PWM. Then it PWMs at 32 kHz between the 1+6 and FET and finally transitions to full FET.