Larry2: Glad to see another flashaholic in Perth. We should try to arrange a little gathering for the local community. /ubbthreads/images/graemlins/smile.gif
As for mods, first thing you need is a Hotlips heatsink. Nothing else matters if you can't get the heat out. You can get that from Hotbeam.
LuxIII with resistor is probably the scariest, especially considering how much it costs in Oz dollars.
LuxIII with a DownBoy set to 800mA (or even 1000mA if you like living on the edge) from the Sandwich shoppe, or LuxV with BadBoy set to about 900mA. You can probably use the stock reflector if you have side-emitter LEDs. And a bit of sputter will smooth out the beam tremendously.
As for the SL6, I'm working on a design that will replace the plastic head with an aluminium one (for good heat transfer). Since I'm planning it to be good for both SL4 and SL6, the electronics should ideally handle stepup and stepdown, or be interchangeable. We'll see how it goes. I just need to save up for a mini-lathe.
And once I get that lathe, I'll also be able to build a replaceable head for Maglights. Even simpler than drop-in mods, with enhanced heatsinking properties. /ubbthreads/images/graemlins/smile.gif
Just need that lathe! /ubbthreads/images/graemlins/frown.gif