I should mention that I haven't tried heat yet... usually that's a last resort for me, due to the potential for damage to the parts inside the light. I don't think boiling will do it, though... my guess is that you'd need a heat gun, or maybe even a blowtorch to heat the little sucker... so be careful! /ubbthreads/images/graemlins/faint.gif
moephiues, you can do whatever you want as far as modding the circuit itself, but until one of us figures out how to open the top portion of the head (and shares the info with all the rest of us!!!), you're pretty much stuck with the stock emitter, which is okay if you got a good one, not so okay if you got a slightly dim or off-color one. /ubbthreads/images/graemlins/icon15.gif
For my part, after cutting new threads BY HAND (believe it or not, using nothing but a Dremel and a VERY steady hand!), I removed the stock circuit since it was damaged, and instead installed the VIP circuit designed by georges80 for MR Bulk's famed VIP flashlight. I left the circuit set to operate at 750mA constant current output, then fashioned a new positive contact plate using a copper-clad circuit board, a hole cutter on my drill press, and a spring to make the contact with the battery. The result was a KL1 gen4 head capable of pumping 750mA to the emitter for a substantially more powerful beam than provided by the stock head, with the downside being that the VIP board is only capable of running in a 1x123 configuration. I've since sold that head... hope the recipient has been having some fun with it! /ubbthreads/images/graemlins/smile.gif
So bottom line, you can do pretty much anything you want with the circuit, but for now, the important thing will be making sure you get a really good emitter in the KL1 gen4 head you pickup. The Luxeon lottery lives again! /ubbthreads/images/graemlins/ooo.gif
Hmm... it might be interesting to install a LESS powerful circuit than stock, like perhaps a Nexgen or Downboy with 200mA output. The result would theoretically be a light capable of running for a loooooong time (like 4-5 hours on 1x123!), but still capable of throwing the beam a decent distance by virtue of that nifty optic inside. /ubbthreads/images/graemlins/smile.gif