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?

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

Yep, green, I’ll post a photo

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!!!

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.

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

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.

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?

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. :slight_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.

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.

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

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

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

XML2;

Vs XML

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

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:

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

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

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.

Hes talking about the GREEN sinkpad…

Meant sinkpads…no need for the condescending tone

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??