The Y3 is a great light thats for sure.
But I wonder if anyone tried to put this LD34 driver into this light, the stock driver has 22ish mm and that driver has 23,6 according to spec (haven’t seen an exact masurement). It has an on board switch that could fit. It has a voltage range up to 8,4V and uses constant current regulation. The UI is good imo(Convoy L4). You might even change the current with the Key-Set method that “Simon” posted somewhere (Has to be checked). I don’t know if it works with MT-G2 LEDs but CC would be a great benefit. Sould give you great efficency in lower modes.
edit: Whoops just noticed that the stock driver is a 23ish mm driver so that makes the task in hand a lot easier. Might be a perfekt fit, the little knob won’t fit anyways so you either have to drill a hole or just file it of.