Fireflies ROT66 Flashlight

The MK34 was such a disappointment that I sold it.

My ROT66 encountered some waterproof problem so I returned it to Fireflies for a replacement. The O-ring right between the lens and the SS bezel seems slightly too small and thus not really waterproof.

Just noticed that on my ROT66, the lens O-ring is different from that on maukka’s (translucent vs. red).

Wow, on my ROT66, after Turbo (ramping) is activated, the default thermal step-down will kick-in in ~30 seconds (down to ~1500 lumens). And then within 1 minute it will step-down again to ~700 lumens and keep this output regulated. Maybe my reading is on the higher side?

You can configure the step down tenperature in the BarsilUI

Of course, but IMHO its default setting is good enough (short Turbo though). The max temperature around the side switch is ~45°C, which is fairly good. And after stepping down to the highest regulated brightness level, the max temperature is ~43°C after two hours.

Just FYI, the default mode set group (4) with (moon) - 0.25 - 3 - 33 - full FET have both the 1x7135 and 7x7135 selectable. They are the middle modes 3 and 33. Makes testing the runtimes and efficiency easier since theyre’s no way to activate those in ramping mode. No default 1x7135 like on the D4.

edit: this is from the Q8 quick manual. On the NarsilM reference manual the modes are called moon - 2 - 10 - 40 - full.

Good mode spacing!

Yeah, the default mode-set is:

Moon (7135 x1, PWM)
7135 x1, –20- ~10 (PWM)
7135 x1, 100%
7135 x7, 100%
FET only, 100%

right?

Exactly.

What I don’t particularly like is that changing the batteries resets the light back to ramping mode.

And with a quick testing without proper sphere calibration and just using a lux meter I measured the 7x7135 mode at about 720 lumens and the 1x7135 at 105 lumens.

Keep in mind that NarsilM is not designed to step down to the “highest regulated brightness level”. In ramping, the drops from max/turbo will be as follows:
1st: 100% (150) to 55% (125)
2nd: 55% (125) to 31% (105)
3rd: 31% (105) to 14% (88)
Drops will continue (if necessary), but stop occurring once it reaches about 150 lumens, or 0.35 amps.

So if it happens to stabilize within the upper part of the regulated mode, it is just a coincidence. Maybe a happy coincidence? :partying_face:

It definitely should not do that. All settings (modes, thermal, etc…) should be stored permanently unless you go into the menu and change them. This will need investigating.

It may be possible to get close in ramping if you use the switch blinks. I assume it still blinks twice when using the FET and once when using the regulated mode?

You would just ramp up to about 600 lm, release the switch and see if it blinks once or twice. If twice, then you need to ramp down a little. After a couple of tries, I can find that highest regulated level on my GT Mini.

This light is using NarsilM v1.2, right? It has a reduced level at the top of the ramp and full turbo with a double click?

If so, then the mode sets are a bit different. Modes 1-6 use the top of the ramp as 100. Modes 7-12 use full turbo as 100.

This light is still new, so I’m not sure what exact UI it’s using or if it has any special tweaks.

No, not unless Fireflies rewrote the NarsilM code, which seems unlikely. It seems they did.

Modes 4 and 10 (each have 4 brightness levels, not counting moonlight) are spaced as follows:

12.5%
25%
50%
100%

This is based on the percentage of light.

If moonlight is turned on, you will see 5 total levels.

There’s a very subtle blip/pause at the 100% 7135 levels while ramping. So that helps too.

But I think there’s something wrong with the light not remembering the ramp/mode setting made in the config menu. Haven’t had to chance to test other options yet.

edit: it does remember the blinky modes on/off setting though so maybe the ramp/mode is a decision to prevent situation where the user accidentally deactivates ramping? At least it indicates that the non-volatile memory is working.

edit2: after another runtime test it did remember the mode config after several battery changes and didn’t revert to ramping

FireFlies, could you please explain the light not retaining settings between cell switches?

Oh how I crave beam shots!

Comparison with the Q8 from steel_1024:

Barsil?

Is the ROT66’s code published anywhere? I’m not sure if I need to go bother someone about license compliance.

I sent Fireflies a message about it last month sometime, but I’ve been travelling and haven’t had time to follow up yet.