That is a Sofirn C8S host with Simon's 22mm SST-40 (max 8A) linear driver. Driver filed down to a tad less than ∅21mm and modified with an additional (slightly contact worn) R050 sense resistor. Measured 8.1A+ max current with power supply.
I am getting 132-133Kcd at 30s, 137-138Kcd peak, at close to 5 meters of distance using ceilingbounce app. Measured the same way I did with M1.
I measured ≈150Kcd for this build weeks ago, with an old reflector I swapped due to some minor damage. Driver was not modified at that point (I measured ≈7.63A back then).
Smartphone is a Lenovo Zuk Z2 Pro (Z2121 with custom Oreo 8.1 ROM). Do not know how good or accurate it is measuring illuminance, albeit I know it measures less than a Moto G 2013.
But heck, the intensity is way off I think. It should be getting at least 180Kcd… should be. The reflector's opening is ∅9mm, and is a little bit taller than the usual Convoy reflector (≈32.2mm).
Geez! :(