Fireflies ROT66, Born for fans of flashlight

Got mine today. DOA

2 of them don’t light up and all the emitters are crushed. Also missing gitd tape inside the light.


Thanks… I am going with the black host either way.

You’re misunderstanding. I wasn’t saying all of the champagne colored lights had their thermal protection calibrated too low. It just doesn’t work like that. Each individual MCU or micro processor control unit (Atiny85 in this case) has its own unique tolerances concerning the baseline temperature reading. It samples the temperature inside the MCU itself as opposed to an external temperature sensor. The firmware being programmed into all of them are set at the same temperature, but Fireflies can’t go through each light and calibrate the baseline temperature. So some lights are going to activate the thermal protection too soon and others may activate it too late, there’s always going to be a certain variable. So if it’s not functioning the way that you like, the easiest thing to do is just manually set it yourself.

When you try to remove the optical lens.
You rotated the optical lens.

Then, You removed (Cut off) all the “roof” of the LED.
There may be some LEDs injured?

It’s a design flaw, not user error. And no domes have been cut off; XP-L HI emitters don’t have a dome. The problem is that the optic was not designed for XP-L HI — it rides too deep and slices into the emitters. Basically, the lights were broken at the factory by tightening the bezel too far.

This issue is known by Fireflies, and it is the reason why the XP-L HI version is no longer available. It has been replaced with XP-G3 and SST20 instead, because they fit into the optic better.

It does. The temperature sensor is in the attiny85 chip, which is not calibrated. It can vary by 20 C from one chip to the next.

On newer firmware, which I think might be used on the next batch, there is a calibration function to help make the behavior more consistent. The user can calibrate the sensor by telling the light how warm it is now, and also set a limit for how hot it should get before stepping down.

Oh!

I understand

:person_facepalming:

The xpl-hi base is slightly taller than the Nichia base. It seems the optic height was adjusted for the Nichia. So when they installed the XPL and tightened the bezel it would crush it slightly.

I knocked my ROT66 219b over yesterday and the LED’s flickered then went out, is that normal?

Also still no sign of my replacement head for the XP-L.

A firm tap on the bottom will do it too

Will make the LED’s flicker?

flickers once or twice then turns off

Cells lost contact:

The flickering seems to be the intended behaviour after inserting cells (= powerup).

I just received the first ROT66 219B champagne color that I ordered before the GB. It got stuck at HK custom for over a month. The other two ROT66 I ordered at the last day of the GB came two weeks ago as posted above.

Anyways, I did a quick read with the TA Lumen Tube and got 4,560 lumens at 1s.

Thanks for reviews. So far we have heard great things about fireflies lights and warranty. some people even bought 3 of them member like skv, and twisted raven… this tell me fireflies is a good light.

Yeah, I have 2 more on the way :person_facepalming:

Any idea how long turbo would last with the XPL hi V3 3A?

Should I wait to grab a Rot66? Seems like there’s little issues here and there, will they iron everything out? I really want a 219b sodacan!

Maybe wait until we hear about people getting their faulty ROT’s sorted by Fireflies.

good news! :wink: