What manner of testing are you doing for these readings.
I am not trying ti argue or even trying to dispute your post. As of right now I still do not have a 35 high that I can actually test myself I only know that the calculations show it should easily do.
The 70.2 on the other hand I have proven on video not once but several times that the 70.2 will easily hit 15k lumen and most of the time closer to 16k.
The readings you are posting are about 3k lower than my own and factory testing of the 70,2 so I can easily believe that if however you are measuring the lights has you 3k lumen lower than my own testing and what you are posting on the 35 high version appears to be almost exactly 3k lumen short of what the expected output should be.
Actually that makes me feel pretty confident in the actual output of the 35 high before I even get to test it. If you are 3k lower than I can show right this moment on a 70.2 version and also show readings of many other well known lights that will show the correct output using the gear I have been suing for over 3 years now to be at least 15k lumen if not more then I should get a similar reading when I do get to test a 35 high. If your is 3k low then mine should be dead close to what is expected. Just judging by the numbers that you have posted.
I just tested a totally new untouched 70.2 and 15789 lumen on the first test. If you are 3k below that on both models then I feel better already without getting to test one yet.
I will still not pass judgment until I do have one in my hands that I can test though all 3 of my integrating spheres.