Great build. I’m planning to assemble a S2+ with a Nichia 219C with a 7135 linear driver myself.
Did you have to bypass the stock switch or replace it with one that can handle higher amps?
I’m curious about your lux measurements. I’m assuming your TN12 is the one here: http://www.candlepowerforums.com/vb/showthread.php?381869, which has a larger and deeper SMO reflector (IIRC), puts out 1020 OTF lumens and only 12,000 lux as measured, compared to your 22,000 lux measurement.
Also assuming your S2 is actually pulling 5A, then according to the plot here: https://budgetlightforum.com/t/-/34094, the 219C should put out around 1,200 lumen (OTF?). Assuming an approximate linear relationship between lumen and lux, if the TN12 put out 1,200 lumens, its lux would increase to only 1,200/1,020 * 12,000 lux = 14,118 lux.
How can your S2, with a smaller and OP reflector, even under the generous assumption that it’s pumping out 1,200 lumen @ 5A, register 30,000 lux?