Fireflies ROT66, Born for fans of flashlight

I’m not going to your youtube despite the shameless plug but it’s not surprising that the more floody the light the more impressive and bright it looks.

You no longer have a TA tube. You have a box of your own making, calibrated as far as I can tell to some arbitrary factor to make you high lumen lights read what you “feel” is the right number

PLEASE, let’s not start over this thing again!

This is a thread about the FireFlies ROT66!

It has been nice to read the posts till here, even for a guy that doesn’t have money to buy this flashlight!… Let’s keep it that way!

Please, let’s keep the thread clean about the TA tube or KG lightbox or whatsoever!!! That issue is beyond contagious and exhausting for those that just want to read some things and see some beamshots…

Create a proper thread to discuss that, compare measurements, improve readings, whatever…

But please, let’s keep the other threads rolling about the issues they were made to present/discuss! In this case, the above mentioned flashlight…

Instead, give us some beam shot comparisons, tint comparison of the different leds, something the make us get :open_mouth: and :laughing: and even :heart_eyes: , instead of :weary: or :person_facepalming: and eventually :frowning:

Just saying folks…

^ I agree, and here’s a quick beamshot of my little square to get back on track :slight_smile: , trees are at 25 meters.

That is a WOW :open_mouth:
I believe the tree further away will be like 40-50 meters and still being quite illuminated !
This beam is one of the reasons why I like flooders over throwers!

Thanks for sharing djozz :+1:

They are not live yet, I’m trying to get the local sculpture park to let me have a wander around and capture some Patinas with the Rot66 Nichia on the Henry Moore pieces etc. It’s risky as the place is a hotbed for Cruising and Dogging.

I love the Nichia but I advise people to avoid buying the XP-L as a few are shipping with crushed LED’s inc my sample.

Very close to maukka specs… djozzz tube did pretty good too.

My tube is a very specially shaped tube, it is a spherical tube in a square box :slight_smile:

Djozz, did you calibrate yours with Maukka’s calibration lights? Btw, that’s a very creative lumen sphere.

Follow his link for the sphere builds. He built these way before Maukka was offering his lights, plus I don’t see his name on the order list.

Before maukka started offering his lights, this spring I had an exchange of a couple of lights with him to check his calibration against my djozz-lumen (the djozz-lumen I found two years ago already 9% high when at TLF-meet-up re-measuring a couple of lights that were measured before in the Led Lenser sphere in Germany).
The calibration difference between maukka and me was different for a neutral 5000K 70CRI Nitecore P12 (djozz-lumen 7% higher than maukka) and for a BLF348 with 4000K 90CRI 219B V1 (djozz-lumen 11% higher than maukka). I have not found yet where the spectrum difference comes from (could be a few causes).

For the ROT66 numbers I substracted 10% from the djozz-lumen to correct for a high CRI Nichia that is a bit higher Kelvin than the BLF348 that read 11% high.

Driving me mad now, it’s reading 4600 tonight with fully charged Sony VTC5A x 3 and VTC6 x 3, down 1100 lumens on a few days back, but if I click off then go back to turbo I keep gaining 50+ lumens or so each time, the hotter it gets the brighter it gets at turn-on.

4600 at 4.20v 25c
5200 at 4.10v 40c

It doesn’t increase Lumens as it’s running though, only at turn on. My other lights aren’t doing it. My XP-L has a busted LED and the 219b seems to have output issues.
I wonder if the springs are expanding with increased heat giving reduced resistance or something. Ever so slightly loosening the tailcap reduces lumen output too.

Oh yeah it sets shop alarms off from 50m away too!

(I filmed it)

I’m filming it against the Noctigon M43 219C 80CRI and the ROT66 makes the Noctigon look unbelievably green. The D4 219C 80CRI stands up ok though, whitish subjects look super accurate.

Just got up, cold UK morning the ROT66 returns 4280 lumens at 4.07v, just warming the old girl up to 4600!

Weird.

Vf of most LEDs has negative temperature coefficient, this means LED current will be higher as temperature increases when DD driver is used. More current means more lumens.

It seems to peak at around 4.10v, I let it cool and fired it up at 4.10v and it was still 5000 lumens, it was 4500 lumens at 4.20v cold

My D4S records 4400 at 4.20v and 4600 at 4.17v from cold, Is this normal?

I was hoping the high CRI would reveal the Predator earlier

I just received my Fireflies that I ordered on the last day of the GB. I still haven’t received the one I ordered before the GB.

Here are the results measured with the TA Lumen Sphere calibrated with Maukka lights.

Champagne host 219B 4500k 9080
4650 lumens at 0s
1482 lumens at 30s
Dims at about 17s

Black host 219B 4500k 9080
4500 lumens at 0s
3991 lumens at 30s

Edit: The champagne host was tested with fresh off the charger VTC5D and the same cells were then used on the black host so that might have accounted for some of the lumen differences at 0s.

I tested the Champagne host twice and it steps down at about 17s. It doesn’t do that on the Black host. Anyone have any idea why that is?

The tint is super nice. It’s the best looking tint I have seen to date. I was afraid it might look too magenta as some people have commented on the 4500k 9080 but I’m so glad it is not magenta at all, just some pink/rosy. Even on turbo, it’s not as rosy looking as what you see in the pics. It’s very white at the center of the beam. On the lower modes, it is just neutral white and perfect.

I compared it with all of my other lights that looked neutral tinted before and now they look ugly yellow/green.

That’s how it starts. After seeing a truly good tint, nothing else will ever look quite the same again. And now you’ve got a lifelong affliction, because unfortunately this condition is terminal.

My sympathies.

Despite I don’t agree with your perspective on lumen measurements, I enjoyed your video. The comparisons were excellent. :+1: