Fireflies E07 preview

I think they just glue the bezel to the head. I'm not sure if I did the right thing ordering the glued version so I could get the warranty.

Not sure why your 5D is so greenish yellow. The 5D tinted lights I have are all much rosier than the SST-20 4000k.

OMG so it is true after all that they don’t use thermal paste.

If you are concerned you can use 90CRI LEDs and it would probably do ~7,000lm at a much lower vF

If you want the Vapcell 40T, why don’t you PM Vapcell_Dennis on BLF and he will steer you in the right direction. I have this cell and it measures 4,038mah and output on the E07 is just slightly less than the 30T. Excellent cell.

They really do, don’t they? I love how the LH351D emitters look, and they make a great beam in a lot of lights. The output is impressively even and consistent.

I just don’t like the beam under a 10507 optic.

It’s amazing how much difference that makes, no?

Thanks for mentioning that… so far the D4 with XPL-Hi V2-5D is the only light I have with “5D” tint. I thought it didn’t look nice (greenish-yellow, as you mentioned), so I didn’t try gettting that kind of tint anymore…)

I have an Astrolux S1 with XPL-HD “5A” tint and that light looks rosy…

It’s sort of off-topic here, but maybe someone can send me how a 5D tint is supposed to look like?

Hello Sir

Thanks for sharing the information.

Here is the story.

At first batch of ROT66, we used many paste under MCPCB, but still has some emitter-burnt issue. We inquired the paste suppier about it.

Then we got an answer from their technicians.

1. For thermal conductive rate: Flat surface metal > Paste >unflat surface metal. In reality metal surface are not 100% flat, so we need add thermal paste on the metal surface. They guide us that If the metal surface is flat enough, we should add a thin layer of paste on the metal surface to ensure the best thermal conductive.

2. The bottom of the MCPCB is very flat , The aluminum shelf is not 100% flat, So we added a thin layer of paste on the E07 head. We have done a lot of thermal test , no one led burnt at max turbo.

*For E07 SST20 / Nichia version , we only recommend max 20A battery , 20A battery can reach max power for E07 SST20/Nichia version. With a 30T battery on SST20 or Nichia the turbo will go blue no matter how much paste used.

30T battery is better used for E07 XPL version. *

Thanks
Jack

And we have done a lot of thermal test on stocked E07 , no emitter-burnt issue happened.

I wonder how much lumens the E07 would produce with Luxeon V’s in it :smiling_imp:
Too bad that would most likely require a special board made by @led4power.

Yes, and DB Custom knows all this. He makes some of the brightest and hottest lights in the world.

However, what he found was not metal to metal contact. It was not metal to paste to metal. It was aluminum to paste to air to copper. This is even worse than having too much paste. There was an air gap between the copper piece and the aluminum, and it is important to make sure that gap is filled with paste instead of air.

It is true that the paste should be as thin as possible… but it should not be so thin that it leaves an air gap.

@FireFlies, I have a question.

My E07 makes a clicking sound sometimes…

First heard it after deactivating the Aux LEDs
Heard another click when I run turbo for a few seconds, then another one after ramping down

Heard another click while light was off and in standby and lying next to me.

Why is that? Why does it make a sound? Is something broken? I got the light today, like one hour ago.

Looks like the shelf isn’t perfectly flat. There is contact on the edges of the MCPCB but not in the middle.

I seem to have an underperforming light . I bought 2 . One is an XLP 6500k . The other is an SST20 5000k. The XPL will hit 6800 lms at turn on . ( TA meter ) The SST will only reach around 1500 at turn on with fresh charged 40T . I have cleaned all connections , tried different batteries , It drops very quickly 2 seconds after turn on . Down to like 500 lms.
I have not checked thermal configuration . After seeing DB’s post of no thermal paste , I am not sure what the safe , maximum temp I can set it at . Also , does this seem like it may be the the cause of this lights problems ? ( thermal config )

I so want one of these, on the other hand, I so don’t! Maybe in 6 months time…… nearly all the feedback on Fireflies lights seems to be 50/50 on quality/problems etc. Still this can only mean better things to come. :slight_smile:

I don’t need a flashlight but want one :slight_smile:

Personally I’m going to wait* for a review with runtimes/effiency.
*=Unless someone posts a good discount code, then I may change my mind :slight_smile:

Thank you Jack, yes I do understand all that… the thing is though the MCPCB has hard square edges on the bottom of the board and is made to fit very exactly into the head of the light. On the other hand, the light has rounded edges where the walls meet the emitter shelf. This prevents the MCPCB from sitting down onto the emitter shelf and making good firm contact. With such a thin film of thermal paste applied to the emitter shelf, nothing touches the MCPCB. Heat is forced to travel into the mass of the head through the extremely small contact points where the corners meet. Not ideal at all.

The fix is a simple bevel of the MCPCB, so it can sit all the way down onto the Aluminum shelf. OR, a slight reduction in the overall diameter of the MCPCB. OR, a square cut between the shelf and walls of the head. It’s really such a very small bit of contact blocking correct fitment. The copper MCPCB is thick and robust, well done on that, and also why the light still works as is. :wink:

My E07 Nichia also has this problem (Worried that the light glass is bursting…), it seems to happen in high brightness,
This one also has the broken off leg on the optic。 :person_facepalming: :cry:
.
You can try to turn the top metal pressure ring away. Remove the TRI lens and adjust it to the installation.

.
My E07 SST20 has no broken feet, but the TRI lens has a distinct bubble. :cry: :cry: :cry:

Just a minor difference, such as night and day for example!

My XPL HI E07 also makes an occasional clicking sound. This happened a lot more when I first got the light. With time, this seems to have diminished. Maybe the sound is air under the star heating up?

In any event, it does not seem to affect performance in any way. My EO7 performs great.