This is *almost* a drop in replacement for Luxeons. Seoul ties the heat slug to the anode (positive), but Luxeons have their slug tied to the cathode (negative). If your heatsink is tied to the negative, you will need to either isolate the LED with mica or kapton, or rewire the device you are upgrading so the heatsink is either floating, or tied to positive.
The regulator will also need to be reworked or replaced if you are upgrading from a lower powered emitter. In my case, there was a 5.6 ohm resistor which I swapped out with a 2.0 ohm resistor.