My system is finally wearing out, at least the headlights (12V, Optronics metal housings, MR16 bulbs, 10Ah NiMH), so time to upgrade/replace.

What is the brightest narrow beam LED in an MR16 base bulb out there?

Any other housing choices out there besides the metal Optronics? Needs to be as (or more) durable as the Optronics, which I've regularly patched and repaired but they're now used up and need to be replaced.