Here's a mod that I did for someone on another forum, not sure if he's here on CPF too. Nothing out of the ordinary but I don't think this has been done before as everyone goes with the quad die setup in KL4s. I've done plenty of P7 & MC-E KL4s but this one is probably my favorite.
Owner wanted more throw so I bored out the head to accept a McR-20. Made a tighter fitting beefier heatsink. Driver potted for extra protection. Hope the owner enjoys!
-Luxeon K2 TFFC UWOE
-SOB1250 (measured 1244ma)