EagleTac T100C2

I was about to order the P100C2 when I saw this, for $10 more I could get better throw, 18650 support (the official flashaholic battery) and extra accesories, so why not.

What I can't undertand is if both uses the C850 engine why the P100C2 has flat regulation from 3.7-8.4v and the T100C2 doesn't.

Eagletac says semi-regulation below 3.4v but anyways I dont think there are much power left from a <3.4v cell. Waiting for runtime graphs...
 
richardcpf said:
I was about to order the P100C2 when I saw this, for $10 more I could get better throw, 18650 support (the official flashaholic battery) and extra accesories, so why not.
Click to expand...
Because it's significantly bigger than P100C2.

richardcpf said:
What I can't undertand is if both uses the C850 engine why the P100C2 has flat regulation from 3.7-8.4v and the T100C2 doesn't.

Eagletac says semi-regulation below 3.4v but anyways I dont think there are much power left from a <3.4v cell. Waiting for runtime graphs...
Click to expand...
They have buck only circuits (not buck-boost) which means they're regulated as long as battery voltage is higher than emitter Vf. But, as we all know, Cree doesn't check the Vf (like SSC or Luxeon) and:
1. Eagle-Tac uses selected emitters with low Vf.
2. Preproduction sample has low Vf. production ones varies a lot like here:

XP-E use the same dies so the differences are the same and sometimes it's much higher than 3,4V (e.g. 3,7V - 1 hour regulated, 2 hours unregulated).
 
Toaster said:
Olight M20 performance on 18650 is quite poor. Peak output on 18650 cell is only around 83% of that compared to running on 2xCR123. In addition it is running direct drive on high with 18650 so output is constantly falling. T100C2 on the other hand is set to deliver flat regulation and same peak output on both 2xCR123 or 18650 cell. It may be similar in performance and function to a TK11 R2 but it comes in at just 60% of the cost. Same performance at almost half the cost certainly counts as a step forward in my book.
Click to expand...

I was primarily basing my thoughts on information from review forum. Even with direct drive, doesn't M20 run close 3 hours to 50% brightness on high? Just hope that flat regulation on high mode wouldn't decrease the runtime.

And just caught my eye..."EagleTac 18650 Li-ion" batteries??? Did they make batteries before?
 
can someone please clear this up for me, will the t100c2 have a nice flat regulation like the p100 series? It says something about being regulated until the battery gets down to like 15% or something like that. When i saw a 3 hour runtime on high i was thinking atleast 2.5 of that would be regulated?
 
im a newb when it comes to this stuff,, so only 1 hour of the 3 hour runtime will be regulated. That takes a little of the wind out of it for me. My t10c ran bright until it pretty much just shut off, it sounds like this light is going to fade???
 
Toaster said:
Olight M20 performance on 18650 is quite poor. Peak output on 18650 cell is only around 83% of that compared to running on 2xCR123. In addition it is running direct drive on high with 18650 so output is constantly falling. T100C2 on the other hand is set to deliver flat regulation and same peak output on both 2xCR123 or 18650 cell. It may be similar in performance and function to a TK11 R2 but it comes in at just 60% of the cost. Same performance at almost half the cost certainly counts as a step forward in my book.
Click to expand...

Couldn't of said it better myself.:thumbsup:
 
bigfish5 said:
so only 1 hour of the 3 hour runtime will be regulated.
Click to expand...

No that is very likely incorrect. If you look at the runtime graphs of the P100C2 they stay in regulation for most of the charge on the 17670 cell. Supposedly the T100C2 has the same circuit, so it should have a very similar runtime graph on an 18650. I won't believe it until I see a graph or test it myself, but it sounds like a home run to me.
 
Looks like this light might be the reason to get my first EagleTac.
🙂

But I was really excited about another preorder light and it got recalled.
🙁

I will try to wait on a review first but it looks pretty unlikely!
 
PhantomPhoton said:
No that is very likely incorrect. If you look at the runtime graphs of the P100C2 they stay in regulation for most of the charge on the 17670 cell. Supposedly the T100C2 has the same circuit, so it should have a very similar runtime graph on an 18650. I won't believe it until I see a graph or test it myself, but it sounds like a home run to me.
Click to expand...

As I said. Circuit isn't everything! It works only when battery voltage is higher than emitter forward voltage. But Cree doesn't chck that so it's a lottery. With lover Vf, let's say 3,3V it is regulated almost to the end (like in mentioned P100C2). But when Vf is higher, for example 3,5-3,6V it's regulated for 50%. And as I said - it IS Cree lottery. One P100C2 is regulated nicely while the other one (not tested) is direct driven for most of the time. T100C2 uses the same circuit so it behaves exactly the same.
 
I think the best lights are the ones that are regulated for 85% or so of the batteries life.
Think about it. it's nice to know when the battery is getting low.

I had a bad experience last summer while i was camping.I was using a light with 100% regulation when i took a walk to the comfort station.
It was a 5 min walk in pitch dark i mean pitch dark you can't see your hand in front of you.
Well on the way back to the campsite the light gave up the ghost with no warning.

I stopped dead on my tracks. Stood there for a few seconds to see if my eyes would adjust to the darkness,no luck.There was no moonlight at all pertruding through the trees,i was in complete darkness.

Then i remembered i had a Fenix LOD on my keychain and i had my keys in my pocket.
Whew! Now i always carry a spare battery with me.

These new lights from EagleTac have raised the bar a bit. I'm sure other manufacturers will follow suit.
Excellent quality,smooth beam,great runtimes on a single 17670 cell and regulation for 85-90%.
I think i'll pick up the T100C2 when it comes out too.
 
phantom23 said:
As I said. Circuit isn't everything! It works only when battery voltage is higher than emitter forward voltage. But Cree doesn't chck that so it's a lottery. With lover Vf, let's say 3,3V it is regulated almost to the end (like in mentioned P100C2). But when Vf is higher, for example 3,5-3,6V it's regulated for 50%. And as I said - it IS Cree lottery. One P100C2 is regulated nicely while the other one (not tested) is direct driven for most of the time. T100C2 uses the same circuit so it behaves exactly the same.
Click to expand...

That's correct. CREE doesn't sort their LED VF, but we do. 90% of the XPE VF lays between 3.4V to 3.5V, which is consistance with CREE PCT. 😎

Nicole
 
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Thanks. That's what I was thinking in #1 here:
phantom23 said:
But, as we all know, Cree doesn't check the Vf (like SSC or Luxeon) and:
1. Eagle-Tac uses selected emitters with low Vf.
2. Preproduction sample has low Vf. production ones varies a lot like here(...)
Click to expand...
And it's great! Shame P100C2 doesn't fit 18650 cells (like Jet-III ST does) and T100C2 is too big... (10mm longer than T10L)
 
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