RMM generally carries drivers in 17mm, 20mm, and 22mm. 14mm and 15mm are nice for AA/14500 lights, but that’s probably way too small to fit the parts. And 46mm drivers are handy for soup can lights. But 17mm shows up the most often.
Rey recently made a light with 2 kHz PWM, and people got a little upset because of the visible pulsing. Someone even made a poll about it. He ended up making a new driver with 9 kHz pulses, though that’s toward the low end of what people generally like around BLF because it’s still within audible range.
It’s hard to go too low around here. Personally I like my moon mode in the range of 0.2 lm to 0.4 lm, but it’s rare to hear complaints even down at 0.03 lm. It doesn’t really matter if it’s hard to see in daylight; it’s all about how it looks with fully night-adjusted vision… like when waking up halfway through the night.
People even seem to like the super-low L2c firefly mode on Zebralights, which is less than 0.01 lm.
So, I wouldn’t bother raising the floor unless it actually fails to light up at all on a nearly-empty cell. The lowest level varies with emitter though (and some other factors), so another good method is to do what Tom E did and make the moon level user-configurable.