Prepare Optic

These L2 Optics, although made for Cree LEDs don't account for any connections made atop the MCPCB the Crees I bought came mounted on.

Not that big a deal - get the Dremel (or knock of rotary tool) out and mill the bottom a bit. The adhesive that's fitted bottom of these does nothing but get in the way of that process though - so chop out where you'll be milling first.

Oh - stuff something (tissue here) in where the LED goes - don't want hot plastic shavings getting in there.

See Rob's Homemade LEDs for more about this.