carefully score thebackof the board with a hack saw about 1/2 the depth. Then use pliers to bend the board backwards and use a sharp knife to "peel" away the emitter. Cut away the optics holder first and be sure to unsolder the leads first.
make it quick! slip someithing underneath the lead closest to the emmitter so that you can lift up on it while melting the solder and the lead should pop right up... Good luck. Not responsible for burnt fingers or damaged luxeons!