I find this information very informative. It shows the max amperage the led can handle as well as how the power scales and where the sweet spot is in the lumen output/current input ratio.
It’s like putting an engine on a dyno. Based on the engines power curves, etc… we can predict the performance of the vehicle we put it in. Vehicles (flashlights) can have a lot of variables, such as weight, gearing, tires, etc… which is similar to flashlights drivers, reflector losses, lens losses, driver losses, etc…
It’s not practical to test leds in a flashlight simply because you have too many flashlight related variables. So I find the raw emitter data very helpful.
I pretty much only use my phone and 150% scale is not an issue at all for me.
My photo posting skills are legendary. 
Go back and reread what I said. Here is the link. It seems that the manxbuggy1 lumen tubes are maybe 10% to 15% high depending on the light (since throwers seem to read higher than normal in them). I originally suspected they were 30% high as TA’s tube was about that and both his and Manxbuggy1’s tubes seemed to be calibrated the same. Appearantly they were not.
Based of Koef3’s tests, at 6A the raw xpl V3 bin shows 1800 lumen. If your getting 1400 lumen OTF, that’s a 400 lumen drop which is 22% less output. This sounds possible. If you got 1600 lumen I might be a lot more skeptical.
Are you saying the 1400 lumen should be less than that because your lumen tube might be reading too high? It’s certainly possible. Even when using the same bin emitter that Koef3 tested, there is only a 14% tolerance guaranteed by Cree. Your actual output might be closer to 1300 or even less. There always seems to be a bit of wiggle room when measuring flashlights outputs. If your led happens to be in the lower range of the tolerance and the losses in the flashlight are pretty high and your lumen tube is reading a bit high, then sure it can read 1400 lumen. It makes perfect sense to me.