I’m going to rebuild a dive light for a friend of mine.
He is using a 12V/4,5Ah NiMH batterypack that has to stay because he is also running other stuff off it.
The case of the light is machined from aluminium and I have no chance do to change anything regarding design.
It’s nearly a straight tube with an ID of 35mm.
Well there are cheaper drivers, but im not sure you would want to use it in a sealed diving light, I believe it is best to use a reliable driver since an ordinary flashlight can’t be used as backup in case of failure.
MR16 drivers are rated for low power 1-3W or SMD leds, to power an XP-L and make it produce a decent amount of light for underwater use you’ll need at least 10W.