Glad it worked!!
Its always the easiest fixes that get overlooked!
I’ve really gotta get the lux meter out on my vinh TN31. I’m expecting similar if not slightly higher since mine runs at 6.5A.
So you take it at 5m and then multiply by (5^2) ? Was your first post calculation correct?
The meter would be on the 20,000 setting?
Yep, my formula was right it’s: distance(meters)^2*lux = lux @ 1 meter.
whoa da - just saw this thread. Actually, my throw measurements are at 4.3 meters, so I tend to get lower #'s. I was thinking your light (and mine) were like 360 kcd, judging from rdrfronty and manxbuggy1's measurements of the same lights we measured (they measures at longer distances too).
Also, that stock copper star in the TN31 is the best I've seen yet - like 25 mm, thicker than a SinkPAD, direct thermal path, screwed down, and of course I used AS5 and sanded/polished the mating surfaces, and beefed up the wires.
I took a beamshot, along with several other lights, didn't post them yet, and you can see the nice wide beam compared to others -- I know at least one guy who doesn't care for the pencil beam of the TN31mb - it is limiting. And the lumens you get with the XM-L2, outstanding... The reflector is really big... 
btw, JOE is the man for this XM-L2 TN31's at $135 shipped (thread on BLF), US. What's sic bout this mod is that it's very little in parts, 1 resistor ($1 at DigiKey), rest is supplies - wire, AS5, etc. Verified - drivers/star in the XML and XM-L2 versions appear identical, I could see no differences.
Edit: Also when my meter battery starts dying, the readings consistently go up and I'm think'n - wow! This mod is really hot!! Then oops, what's that little icon on the display, oh, it s a battery.... Don't know how many times I've been fooled because it starts out slowly raising the readings.... Of course I'm using rechargeable 9 volts from FT.
So yours came with the XML2 already, you just changed the driver to one that draws more amps?
No driver change, just adding a simple resistor mod I did not come up with - was published here on BLF, post #19: https://budgetlightforum.com/t/-/17637, and here: https://budgetlightforum.com/t/-/16603. All the credit to AlexGT!
I used to think the Shocker was bright… Oh how I have been mislead!
TN31 top, Shocker bottom.
Wow, that beamshot looks like the sun. I swear I see the sun flares radiating out.
Not sure if you’ve realised, but you know the pattern you see at moonlight when you shine it 2-3cm away from your table/wall? That flower pattern?
Yeah, that’s still visible from nearly 4 meters away (on 2nd level). Just goes to show that some lights (especially throwers) collimate their beam at a longer distance. Even though it shines 1.2km away, I can’t actually see that far away. But I can light up white houses 780 meters away give or take 20, that is crazy. I wonder what other people are thinking when they see the beam haze from a few hundred meters away.
If the hot spot was any smaller I don’t think it’d be much more useful, so this is definitely around the optimal lux a light should have - at least for my eyes. And I also noticed that the colour of the dedomed XML2 (1A?) is really similar to the dedomed SST90 in my Trustfire X6.
Very excited to see the beamshot compared to BTU shocker. Even more excited that I am getting one too from Tom soon!!!