Ok, I hadpiece eted this as a new pme t, but it sM26 eems like it should go here ... preview: I just got a new TM26 and it appears it may have an XML-2 upgrade from the factory ... there may be a upgraded version in town.
I just got my second TM26 due to the smoking deal IS had ... I turned it on and was taken aback when the OLED said 3800 lumens.
Compared to my other TM26 that is only a month old or so, it still says 3500 lumens. The box my new TM26 came in also still says 3500 lumens.
Looking at the LEDs, you can see a difference (new on left, old on right). The '3800' LEDs have a silver PCB with 2 wires visible into the diode. The '3500 TM26' has a green PCB and 3 wires visible into the diode.
Anyway, I could have been living under a rock (I have been busy lately) but this seemed very noteworthy to me and worth sharing.
I just played with it some more and noticed the other modes are different.
Level 2 is 150 vs 95
Level 3 is 600 vs 540
Level 4 is 1850 vs 1700
Tail stand with no airflow, ambient temp of 68F was 3:44 with a step down at 62-63 degrees C.