Fireflies E07 preview

[FireFlies]

stocked dozens of E07 in CA USA warehouse . These lights are of different simplified UI.
USA warehouse fireglies E07 sale

According to the shipper customers can receive their orders in 3-4 days. let’s see how it works.

[pennzy]

Are the first version issues addressed?

[BlueSwordM]

@pennzy, having ordered a FF E07 back in late June, and received it in July, I can confirm that everything is fixed.

[ControlTheController]

I think I’ve seen the number of the highest regulated level somewhere in this thread, but I lost track of it.
Does anyone know what is the highest regulated level (7135*3 maxed out) and how many clicks do I need to do to set it to that level?

[Dep668]

Tried searching but couldnt find the info. Does anyone know what tint bin is used on the sst20 4k emitters? I am finally going to pick one of these up, just undecided on Nichia or sst…

[contactcr]

If you have to ask just get the Nichia. At the power level these will run (because 7 emitters) it will always be “greenish” at lower levels.

[twisted_raven]

Easy enough to put a lee filter between the optics and lens. Fireflies seems to be using different bins at different points in time during their production. Early on when during their first batches of ROT66, I received neutral/rosy SST20s. Those with a lee 804 filter is amazing. Very recently I got a Cu E07 with slightly green SST20s. Even with a filter on low modes, they’re just okay.

[SKV89]

I just swapped out the stock lens with UCL 35.00mm x 19.00mm lens and got the following measurements:

E07 XP-L HI 5000K w/ stock lens
lumens: 195 lumens
CCT: 4957K
DUV: 0.0025
Ra (CRI): 72.3
R9: –22.1
Rf: 69
Rg: 97

E07 XP-L HI 5000K w/ ucl lens
lumens: 198 lumens
CCT: 5030
DUV: 0.0003
Ra (CRI): 72.6
R9: –19.2
Rf: 69
Rg: 98

E07 XP-L HI 4000K w/ stock lens
lumens: 443
CCT: 4146K
DUV: 0.0030
Ra (CRI): 72.7
R9: –22.8
Rf: 71
Rg: 95

E07 XP-L HI 4000K w/ ucl lens
lumens: 454
CCT: 4184K
DUV: 0.0010
Ra (CRI): 73.3
R9: –18.9
Rf: 71
Rg: 96

I’m pretty impressed with the results. Dropping DUV by 0.0020 is quite a difference. That amount of green reduction is between a Lee Filter Zircon 804 and 805. However instead of losing 15% output, it actually gains 2% output.

[BlueSwordM]

@Control and Dep668, it’s 68 clicks to go to full regulated.

[contactcr]

@SKV89

I just swapped out the stock lens with UCL 35.00mm x 19.00mm lens and got the following measurements:

Can you measure the stock lens if it’s handy? How close of a fit is that?

[SKV89]

Stock lens measures 35.00mm x 1.54mm

[twisted_raven]

You made my day SKV89! Ordered two for my Cu and Cu/Ti E07s.

[Tally-ho]

Jack told me that he is adding 20 degree E07 TIR optics for free with my order so I guess that some people might be interested to know about it.
The current E07 optic is 45 degree.

I’m waiting for it so I don’t know if the more throwy beam will look good.

[twisted_raven]

I saw a more throwy optic on a site that I thought might fit the E07, but it was just a little too large. I wonder what kind of optic Jacky got.

I’d be interested in some for sure.

I received the UCL lenses for my E07s, and the are more clear than stock. The effect of the new lens is about the same as a LEE green minus 1/8th. The lenses are thicker though, so you will have a small gap between bezel and heatsink— it’s very small.

Also 45 degrees sounds very floody. I think current optic for ROT66 is 25 degree, and E07 is very similar.

[Tally-ho]

@twisted raven

Also 45 degrees sounds very floody. I think current optic for ROT66 is 25 degree, and E07 is very similar.

That is what Jack told me in PM :

With your new order i will throw into the package several 20 degree E07 optics, which will have much better throw than the stock E07. You can have a try.

Original E07 utilizes 45 degree optics.

This optic (KingBrite) has the same 4 legs footprint than the E07’s one and have a wide range of beam angle : 10°/15°/25°/30°/45°/60°/70°
I’m not sure of the MOC.
I would have wished FireFlies to sell a few of them with the E07.

[contactcr]

The E07 listing has always said 25 degree TIR but it will be interesting to see what you end up getting. Maybe something is lost in translation but either way more options are always nice

[SKV89]

@Tally-ho

@twisted raven

Also 45 degrees sounds very floody. I think current optic for ROT66 is 25 degree, and E07 is very similar.

That is what Jack told me in PM :

With your new order i will throw into the package several 20 degree E07 optics, which will have much better throw than the stock E07. You can have a try.

Original E07 utilizes 45 degree optics.

This optic (KingBrite) has the same 4 legs footprint than the E07’s one and have a wide range of beam angle : 10°/15°/25°/30°/45°/60°/70°
I’m not sure of the MOC.
I would have wished FireFlies to sell a few of them with the E07.

Wow 10degree would be awesome. Anywhere to buy just a couple to test?

[SKV89]

I found out the mysterious reason why E07 drops in output overtime. The spring flattens out after being compressed and doesn’t return to the original length, which means it won’t push as hard on the cells. The weaker contact results in more resistance and lower output. I took some measurements with these fully charged cells. The 18650 cell uses a 21700 adapter, which makes them a good bit longer than the 21700 cells so the spring pushes harder on the 18650 cells.

Molicel P26A 18650: 6640 lumens
Molicel P28A 18650: 6300 lumens
Sony VTC5D 18650: 6300 lumens
Sony VTC6 18650: 5650 lumens
Molicel P42A 21700: 5600 lumens
Samsung 40T 21700: 5770 lumens
Samsung 30T 21700: 6500 lumens

This same E07 used to measure around 7,570 lumens with the same 30T and 7,017 lumens with the 40T. I swapped the tail cap with another E07 tail cap that is used less and the 40T measurements jumped from 5770 to 6000 lumens. There’s a possibility that I might have tried a 21700 protected cell which compressed the springs too hard causing permanent deformation, but I don’t remember. But now I know to never put protected cells in a flashlight not designed to accept protected cells.

These springs are not bad and all springs flatten out over time to a certain extent, but if Fireflies ever find any springs with better mechanical properties, they can sell them separately as an upgrade. There’s nothing we can do with the spring on the driver side but if Fireflies provide a longer tail cap spring, that will make up for the loss compression.

@SKV89

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?

@SKV89

Edited below to add measurements with Lishen LR2170SF and Samsung 50E. I believe the LR2170SF is the best cell for the 219B version eventhough it outputs the same as the 50E at full charge, but as the battery depletes, the LR2170SF will be able to output higher than the 50E.

@SKV89

Here are a few more measurements of three more E07 using Samsung 30T.

E07 SST-20 4000k, emitters swapped by Texas_Ace (different batch of SST-20): Samsung 30T 4,845 lumens
E07 SST-20 4000k: Samsung 30T 4,888 lumens; Lishen LR2170SF 4,319; Samsung 50E 4,095
E07 XP-L HI 4000k v2 5A, heavily used: Samsung 30T 6,465 lumens;

@SKV89

I took more measurements and here are the lumen results for 4 different E07:

E07 XP-L HI 6500k - QSO VTC6A 6,681; 30T 6,983
E07 XP-L HI 5000k - QSO VTC6A 6,551; Vapcell VTC6A 6,379; 30T 6,733; Vapcell 40T 6,810
E07 XP-L HI 5000k - QSO VTC6A 6,586; Vapcell VTC6A 6,630; 30T 7,327; Vapcell 40T 7,017; QSO 40T 6,983; LG M50 5,353; Lishen LR2170SF 5,866; Samsung 50E 5,268
E07 219B sw45k 9080 - Vapcell VTC6A 3,707; 30T 4,301 (quickly dropping); Vapcell 40T 3,741; NCR21700A button top 2,828; LG M50 3,233; Lishen LR2170SF 3,450, Samsung 50E 3,449

For some reason, I cannot reproduce the 7,570 lumen measurement again. The unit I measured 7,570 now only makes 7,357 lumens. Not sure if the emitters already degraded from me constantly blasting turbo or is it due to some other reason. I’m surprised the XP-L HI v3 6500k unit is not as bright as one of the XP-L HI v2 5000k unit.

I think the 40T is the ideal battery for the XP-L HI version. For the 219B version, I would think the NCR21700A recessed top with 15A would be the best battery but I don’t have a charger that can charge the recessed top and the soldered button top version adds an incredible amount of resistance. Otherwise the LG M50 is not bad for the 219B. The 40T might be pushing it too hard in the long run.

Also I really like the look of this light. The knurling and the very deep and functional heat fins look great. Most of the weight is in the head of the light where it is needed most for heat sinking. Jack said he designed the final prototype with super thick 8mm shelf. I couldn’t measure it but with the optics removed, it seems the shelf is probably not that thick but without removing the mcpcb and driver I can’t say for sure. But it did look like Fireflies listened to our request to increase surface area and mass in the head for better heat sinking and dissipation.

Machining quality is not as good as the Emisar series but not too bad. The clear anodizing version is OMG beautiful and a must have for anyone’s collection. Now I’m patiently waiting for a copper version.

One suggested improvement is to find or make an optic with larger TIR cups for more focused beam. There’s too much wasted space between the cups. Otherwise, I think the size of this optic can fit 10 cups and emitters for an even more amazing flooder good for 10k real OTF lumens.

Overall, this is the best pocketable EDC I’ve seen to date. It is also BY FAR the brightest single cell production flashlight in the world. It is twice as bright as the previous record holder, which is the Emisar D4S.

[Tom_E]

It's something we should all look out for on these high powered lights. I suppose good bypasses would solve that issue. Yet another good reason to add bypasses..

[BlueSwordM]

That’s the main reason I don’t like using BeCu C17500 45% IACS: while it does have better conductivity than BeCu C17530 38% IACS, its worse mechanical properties show up quite rapidly.