Fireflies ROT66 Flashlight

Ok, back to the drawing board...

Actually, I’m a bit worried about the extreme difference between advertised and measured lumen output of the XP-L HI NW. If I recall correctly the ANSI method states lumen output at/after 30s of runtime. So, we have 6.650lm vs. 10.000lm (for the cw V3 1A), i.e. this flashlight only achieves 66.5% of its advertised specs, is that correct? Okay, one could say the nw version might have A BIT lower output - even though it’s the same V3 binning - but 33,5% less seems far too much to me. I’m not even using those expensive VTC5A with low internal resistance but the usual VTC6. Thus I might experience even less lumens than charles lin did with his light.

I’m also wondering how much regulated output would remain with 14 AMCs on the board.

Fireflies test of the 219B version in a 1.5 meter integrating sphere reports a peak reading of 5236 lumens running on 3 VTC6 cells.

So what is the equivalent peak lumens reading Maukka got? I can't find it in the posted result in post #135.

I think first we need to see apples to apples. Then take a look at what that reading really means - Fireflies posted integrating sphere report is probably instantaneous, not at 30 seconds.

Of course it would be great if Fireflies and Maukka used the identical light, identical cells at the same charge level, but I suppose that's not happening? If not, we should expect a possible swing of 5-10% but I think it should be closer than that. Even if you have 7% LED variance, the chances of all 9 LED's varying the same way is pretty remote.

These integrating sphere are all terrific, but they require meticulous usage, regular calibration, and understanding and proper reporting of the results.

Looking at the XPL-HI V3 CW report, it's 9660 lumens at the peak. So I guess Fireflies rounded up to 10000 lumens, but still it's a peak, not after 30 seconds. So Charles lin reported in post #197 he measured 7480 lumens at the peak on VTC5A cells. That's still a big difference of 22.6%, so the questions are is someone's measurements tools way off or are the 2 lights compared different in some way?

And the step-down setting should also be taken into consideration. My ROT66 will step-down before 30s when the default is used. And, with three VTC6s, when step-down is completely disabled, I got ~5050 lumen at 0s and ~4500 lumens at 30s. My DIY sphere is not supposed to be accurate but the relative difference between 0s and 30s was ~10% then.

Still testing, but I get 4325 lm at turn on, 3860 lm at 30 sec with 3x30Q. Complete review coming in a couple of days.

I changed the temp limit. Mine was stepping down a bit too prematurely with factory settings. Now it steps down at about 60 sec. Should back up a bit since it’s getting up to 65°C right now.

Wow, that’s lower than my expectation. Since the Turbo is driven by pure FET and thus can vary greatly due to numerous reason, maybe we should take the max regulated brightness (7x7135) as a base. On my ROT66, the peak output is 5050 / 715 = ~700% if compared with the stabilized 7x7135 brightness. Or 5050 / 740 = ~680% if compared with 7x7135 at 0s.

30Q's should get lower results than VTC6's, but not that much lower based on my Q8 tests - this is 17.4% lower than Fireflies integrating sphere results. So something is off, or the lights tested are different, or little of both.

On 7x7135 mine is 710 at 0 sec. So peak is 609% (6.09*710=~4325).

I suppose you mean 609%, right? My 7x7135 was close to 730 740 at 0s, and it stabilized at 715 after an hour. My numbers are probably on the higher side, however the peak to 7x7135 ratio seems not as high as expected on your sample :open_mouth:

Of course, typo.

After several tests with cooling the light in between the most I got at 0 sec was 4413 lm. The 4325 lm is an average out of three. Using VTC5A didn’t make any real difference, 4440 lm on average with a max of 4500.

What is the actual lumen number you got on the max regulated with your integrating sphere?

So that’s ~630% of 7x7135 at 0s. With 3 x NCR18650GA cells, I got ~4650 at 0s, which is ~630% of 7x7135 at 0s. With VTC6’s, that ratio is ~680% (5050 / 740).

Some white wall beamshots from TIR lights.

The ROT66 will be great for night photography in a US ghost town.

Wonder what a minus pink filter would do for it in terms of subjective and objective differences? Of if the AR coated lens has a tint that’s green/magenta that also slightly affects tint?

My calibrated TA tube measurement for Nichia 219b version is
4740lm @ 0 sec, 4300lm 30 sec. with VTC6 4.2V
Similar test result with either VTC5A or GA.

I took time redo calibration for my TA tube. Now, my 219B ROT66 with 30Q’s measures 4440 lumen at 0 second, 3910 lumen at 30 seconds.

I just want to say that Jacky of Enogear/Fireflies did just reply to my email and sent me my replacement Enogear AA stainless steel and sent me a free stainless steel 14500 usb rechargeable light. Therefore I will definitely buy more of the ROT66 soon. :slight_smile:

Finished my review:

Can I send my DOA XP-L back?