focusable lens for 100w LED?

Hey guys.
I’ve recently been playing around with a 100w LED I got on ebay.

I stuffed it in an old spotlight with a dead battery.

The thing is crazy bright, but I know it could be so much better if I could focus the light.

I don’t care about the housing, I want to ‘focus’ (no pun intended) my attention on the adjustable lens, then I’ll make the rest fit.

Any thoughts?

A focusable lens does not work well with LED arrays. You wind up with it throwing a beam with bunch of little dots.