I was told the SSC P4 will fry in an L4. I know it will work in a KL1 head. I have done the SSC P4 emitter swap with a Mcr20 reflector, and got rid of the optic. The L4 uses a LUX V emitter while the KL1 uses a LUX III emitter. I am completely happy with this set-up. Great Runtime, Awesome Throw, VERY Bright, Nice and White, all around great update for a KL1.
What else besides a LUX V can be swaped into the L4?