Be careful with those fuse values. Give it the wrong number and it can brick your driver.
Anyway, it sounds like you’ve been running into issues with moon mode calibration. Depending on the driver (and some other factors), moon mode will be anywhere from PWM level 1/255 to level 9/255. This is set at compile time, based largely on trial and error, and it’s one of the main reasons why moon mode isn’t more common. Slight hardware changes can make moon mode stop working.
If the existing .hex files aren’t calibrated correctly for your hardware, you’ll basically need to calibrate it and compile with more appropriate values. Typically this involves trying moon values until you find the lowest one which works, and also measuring voltage readouts to make LVP and battcheck work. For drivers with an offtime capacitor, OTC calibration is necessary too… but that shouldn’t matter for biscotti or crescendo since they don’t use OTC.
The button taps are indeed quick. If the button moves far enough to click, it’s way too slow. The timing depends entirely on hardware design, but I’ve seen anywhere from 0.1s to 0.6s as the threshold between a short press and a long press on this type of driver. This morning I actually made a robot determine the tap time threshold on one of my lights, and it ended up being about 0.17 seconds.
I really hope that Convoy now understands how amazingly sensitive some of this stuff is to small changes in hardware. Last time, the driver hardware changed completely between development and production, so a number of things weren’t quite right. I hope now he realizes that one can’t change the hardware without recalibrating the firmware… not even switching to a different brand of 7135 chip with the same specs.
The relationship between lumens and apparent brightness is widely considered to be a cube-root function. Take the cube root of the lumens and it approximates how bright the output actually appears.
For that, you’ll need a different driver. That low mode is about as low as it can go. You could use a “moonlight special” from MtnElectronics, which is designed for this, or a FET+1 like the MTN17DDm. Both are designed to get good performance on both low and high modes, with a separate power channel for low modes.