Fireflies E07 preview

Wonder if they can give us a direct front shot of the optic and a disassembled pic to see how the mcpcb looks like.

Nice idea but one has to be careful with the SST40. koef3 discovered that the bonding wires already burn with about 9A and more than 7.4A are not reasonable. However, maybe the N5 flux bin is less sensitive to overcurrent than N4 tested by koef3.

@SKV89, what do you have in mind ?
Personnally with a “big” TIR, i’m immediately thinking to Clemence’s VR21SP4 MCPCB with the hope to find a frosted compatible TIR.

Tally Ho, that is exactly what I have in mind.

:smiley:

I’m surprised that my E07 dropped in output significantly over time. For example, my XP-L HI version that measured 7,327 lumens with a 30T now measures 5,950 lumens with a 30T, 5,820 lumens with a 40T. I don’t even use this E07 besides blasting it on turbo every now and then for output measurements and tint comparisons so I’m sure it never overheated. My other E07 also lost some output but not as much as this specific one. I leave the cells in these flashlights for the aux light for half a year though. Does the driver degrade over time? Maybe Lexel might be able to answer this since he designed the driver.

Anyone else noticed their E07 output decreases over time?

Sadly, it can’t really be the driver.

It must be the LEDs getting super hot, but the light throttling down too soon.

The 1st gen didn’t have a good flat MCPCB with very poor thermal paste contact. That means the LEDs could easily be at extremely high temps without you knowing.

I take measurements at 2second so it doesn’t throttle down. Just very strange.

I havent notice any lumen decrease on my e07 xpl hi… i got 7150, and 7310 lumen in two seperate measurement.

Do you leave batteries inside your E07? I’ve kept the aux lights on for half a year. Not sure if that is causing the lower output because the one that dropped output the most, I almost never use it.

I click 3 times to do battery check and it was 3.9v and putting around high 5600 lumen.

Does anyone know if the LEDs on the switch can be programmed individually?

No, 2 are always on and the other 2 respond to FW (along with the main aux led’s in the head)

Do you have any fresh cells to compare with ?
That they drop in lumens and if its not cell related does sound worrying… especially after such little use…
I am little bit disappointed with the lack of scientific reviews and tests. Sure… there was a kind of big flood of reviews earlier this year…but honestly…it feel like
all those old reviews are not as relevant today because manufacturing process have changed since then, we should see now much improved thermal performance for instance.
The most hardcore flashholics nad reviews did buy it very earily when it still had some manufacturing problems which should be fixed now… it would be interesting to see how the thermal performance compare with those that are sold today.

it feels like the E07 is not as hot anymore in terms of discussions etc, maybe people are just waiting for the astrolux MF01 Mini, which now seem to be delayed… if I am going to pull the trigger and buy the e07 it would be more confident how to see how the older version and the newer versions compare… it seem many of those flaws people have complained about have been fixed…

Fireflies had E07 IV on their banner for a short time…now its gone… I wonder if they will release a E07 with this branding so one can be confident that you don’t get something from the old batch (which I think is probably unlikely if you buy from their official store), but if they only have E07 from latest batch with perfected manufacturing I would not see why they would not rebrand it so people know its an updated version.

I just did a thorough cleaning with alcohol on both the flashlight and batteries and the lumens went back up but not back to brand new level though. With fresh off the charger 30T, it is now making 6,896 lumens instead of 7,327 lumens. With 40T, it is now making 6,424 lumens instead of 7,017 lumens. This is the flashlight I don’t use often.

The one I used often, the XP-L HI 5A also dropped from 6,465 to 5,991 lumens using 30T. But then 6,465 lumens was measured after it was already heavily used.

I’m guessing the cause is the void between the mcpcb and shelf due to inadequate thermal paste might result in the emitters overheating at those extremely high currents. I’m thinking E07 version 2 with adequate thermal paste should prevent the emitter degradation, especially with the upcoming copper version, the emitters should be pretty safe.

may be the resistance of the flashlight somehow increased. Next time when you do the lumen test you should measure the current as well.

[update]
i found this picture that might explain your situation

What Nitecore says doesn’t matter.

The BeCu springs inside of the are well below 30mOhms.

Of course its resistance would increase to 100mOhms. The spring would be melting at the kind of current Nitecore was pusing.

I use this picture because it has a hint that might explain SKV89’s problem that his E07 reduce brightness overtime. i think the contact might be oxidised so resistant increase.

No, it’s not that. Gold plated contacts don’t oxidize unless the metal underneath melts.

And since the E07 is very recent, the E07 wire/traces/springs can’t really degrade much electrically, so it must actually be the LEDs that are stressed out.

maybe the contact between body tube and tailcap, between tube and the driver is worn out after screwing-unscrewing many times, that why it can be oxidized