How to tell the difference between 2600 and 2900 lumen TK75?

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lionheart_2281
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How to tell the difference between 2600 and 2900 lumen TK75?

Can you tell from looking at the emitters?
The packaging mine came in (aside from being very tatty) says 2600 lumens, which is the older XML U2 emitter version.

Does the box for the newer version say 2900 lumen? Or XM-L2 on the packaging?

skyrider1
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The square surrounding the dome should be silver vs green on the older gen XML

lionheart_2281
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skyrider1 wrote:
The square surrounding the dome should be silver vs green on the older gen XML

Yep, green, I’ll post a photo

lionheart_2281
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Here’s photo’s of the emitters:

I have already spoken to the dealer (who will remain anon at this time) and they said they will organise an express post new one out, should take 2-3 days from China they reckon. They are also sending a postage paid return bag for this one.

Edit: sweet jesus, sorry about the ginormo photo size!!!

InfinitusEquitas
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That's an older XMLu2 TK75.

You can easily tell apart xml vs xmlu2 by the bond wires.  On the XML they run in parallel.  On the XML2 they form a criss cross pattern.

koyotee
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Hm, who the f. sold u the first version?

Finaly, proud owner of a Powerex Maha mh c-9000 for my Eneloops:)

InfinitusEquitas
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If it's who I think it is, he'll take good care of you.  

I had an issue with one light recently, and aside from having to pay for shipping there (and it was my screw up that resulted in me needing service) there were really zero problems, and he shipped the light back to me express.

TheGloriousTachikoma
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It’s 300 lumens. The Human eye cannot distinguis between 2600 and 2900 lumens. That’s less than a 9% increase in the independent variable versus the exponentially-small dependent variable of what your eye interprets. Unless you plan on boosting the driver further, which IIRC is impossible because the TK-75’s turbo mode is direct-drive…why make a fuss? Did you pay more for it than the previous-gen model costs?

InfinitusEquitas
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Assuming the tint/temperature were the same, you would see a difference, if you had both lights, and could do a ceiling bounce.

The TK75 is not direct drive on any mode.  Sounds like the vendor just shipped the older model by mistake.

TheGloriousTachikoma
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InfinitusEquitas wrote:

Assuming the tint/temperature were the same, you would see a difference, if you had both lights, and could do a ceiling bounce.

The TK75 is not direct drive on any mode.  Sounds like the vendor just shipped the older model by mistake.

My mistake, I thought turbo was DD. Sorry. Smile The way I understood it was that the human interpretation of light, like sound, is on a logarithmic scale and that we interpret a doubling in output as a 1/3 increase, so an increase of 9% would look like a 2-3% increase, and I don’t know about you but I’d have a hard time telling a 2% increase in brightness.

InfinitusEquitas
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You're right about perception, but if you had both lights you would be able to see a difference, though probably not outside, only on a ceiling bounce, switching from one light to the other.

A 20% increase is rather easily visible.

lionheart_2281
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InfinitusEquitas wrote:

That’s an older XMLu2 TK75.

You can easily tell apart xml vs xmlu2 by the bond wires.  On the XML they run in parallel.  On the XML2 they form a criss cross pattern.

Cheers for the info, is there a pic somewhere of a macro photo of this?

koyotee wrote:
Hm, who the f. sold u the first version?

I will keep them unnamed, I think they are going to look after me with this

TheGloriousTachikoma wrote:

It’s 300 lumens. The Human eye cannot distinguis between 2600 and 2900 lumens. That’s less than a 9% increase in the independent variable versus the exponentially-small dependent variable of what your eye interprets. Unless you plan on boosting the driver further, which IIRC is impossible because the TK-75’s turbo mode is direct-drive…why make a fuss? Did you pay more for it than the previous-gen model costs?

I paid for the newer XM-L2 version so I expect it.

InfinitusEquitas
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XML2;

Vs XML

 

I'm sure there are better pictures out there, but those are the first I could find.

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Silver & two little gold bond wires is XM-L2, green & three bond wires is the older XM-L. There's no criss-cross pattern on either version.

with the dome removed:

lionheart_2281
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Thanks for the photo’s, so XM-L2 are ONLY on silver bases?

And XML’s are ALWAYS on green? No exceptions?

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They aren't 'on' green or silver anythings, that's the color of the material they're made of. A green XM-L2 would probably be about as common as a 4-door AC Cobra.

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Hes talking about the GREEN sinkpad…

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lionheart_2281
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comfychair wrote:

They aren’t ‘on’ green or silver anythings, that’s the color of the material they’re made of. A green XM-L2 would probably be about as common as a 4-door AC Cobra.

Meant sinkpads…no need for the condescending tone

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Condescending what? You were asking questions common for somebody who doesn't know these things, I was trying to explain that the green part and the silver part is the LED itself, not some other component. They both have the same solder pads/footprint on the bottom, they can be soldered to any board made for that platform.

And where the hell do you see a green Sinkpad?! I see a post with two black aluminum MCPCBs, and another with a white 20mm Sinkpad and a white 16mm Sinkpad...

lionheart_2281
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comfychair wrote:

Condescending what? You were asking questions common for somebody who doesn’t know these things, I was trying to explain that the green part and the silver part is the LED itself, not some other component. They both have the same solder pads/footprint on the bottom, they can be soldered to any board made for that platform.

And where the hell do you see a green Sinkpad?! I see a post with two black aluminum MCPCBs, and another with a white 20mm Sinkpad and a white 16mm Sinkpad…

What’s the green thing the LED is sitting on then??????

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comfychair
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The green thing IS the LED.

 

Does this help? (I really am trying to help, I'm answering questions, I even dug through the parts box for props to take this picture...)

comfychair
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Bare XM-L on left, underside on the right showing the + & - contacts, and big thermal pad in the center

 

XM-L and XM-L2 share the same dimensions on the contact pads on the bottom, they can be interchanged on any board that uses the 'XM-L' layout. There are other brand LEDs that use the same basic footprint and they can all be used on the same boards.

rojos
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comfychair wrote:

The green thing IS the LED.

It certainly is a part of the LED.  I think the actual name for what we normally call an "LED" is an LED package.

The actual Light Emitting Diode part of the package is the die, so technically, lionheart wouldn't be wrong in asking what is the green thing that the LED is sitting on, cuz that would be another way of asking what is the green thing the die is sitting on.

But generally, I think we refer to the entire package as the "LED" and not just the die.

lionheart_2281
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I think we all know what I was saying…some people just enjoy being a bit nitpicky with the terminologies.

Sorry, I don’t mod and still very much a novice at all of this.

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rojos wrote:

comfychair wrote:

The green thing IS the LED.

It certainly is a part of the LED.  I think the actual name for what we normally call an "LED" is an LED package.

The actual Light Emitting Diode part of the package is the die, so technically, lionheart wouldn't be wrong in asking what is the green thing that the LED is sitting on, cuz that would be another way of asking what is the green thing the die is sitting on.

But generally, I think we refer to the entire package as the "LED" and not just the die.

Oh, OK. So if you separate the actual LED from the rest of the package is it still a LED or just a trashed sliver of silicon carbide?

rojos
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comfychair wrote:

Oh, OK. So if you separate the actual LED from the rest of the package is it still a LED or just a trashed sliver of silicon carbide?

Nevermind dude.  You're missing the point.

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And between two XM-L emitters or two XM-L2 emitters of differing tints are there any visually distinguishable differences?

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comfychair wrote:

Silver & two little gold bond wires is XM-L2, green & three bond wires is the older XM-L. There's no criss-cross pattern on either version.

Looks that way if you look at the LED at extremely low output (moonlight mode on the sc52 xml2 for example).

I'll try to take a picture of it.

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lionheart_2281 wrote:
I think we all know what I was saying…some people just enjoy being a bit nitpicky with the terminologies.

Sorry, I don’t mod and still very much a novice at all of this.

No problem, you’ll learn. Smile Just keep in mind this can be a very technical hobby, like cars or guns, or like physics and chemistry, and terminology can sound similar for different components, so the correct terms are important.

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