Did a driver and FW mod on my H03 headlamp. I switched to a simple 8x7135 driver for the current regulation (I had a FET driver with TK’s old ramping UI prior to this). The driver is a 17mm qlite and I used a brass 17-to-22mm converter ring from convoy. I had to sand down the OD for it to fit, and I also sanded down the thickness a bit for a good fit.
I have put a lot of thought into what modes and UI is ideal for this light. I like the ability to start in low by pressing and holding and the ability to move up or down in brightness, which the ramping UI provides. Smooth ramping is nice especially in the lower modes where preserving your nightvision is important, but it’s not ideal in the higher modes when you are more concerned with managing runtime and/or heat. My solution for this light was to modify the ramping table to have smooth(ish) ramping from moonlight to around 40 lumens, then stepped ramping after that. Here’s the ramping table I used:
0,6,6,6,6,6,6,7,7,7,7,7,8,8,8,8,9,9,9,10,10,10,11,11,11,12,12,12,5,13,13,13,
13,13,13,13,13,13,13,13,46,46,46,46,46,46,46,46,
46,46,46,127,127,127,127,127,127,127,127,127,127,127,255,255