To answer your question, yes all 123 batts will work in your LX. /ubbthreads/images/graemlins/grin.gif SureFire 123's are designed for high drain, so they might even work a little better than the brand you are using now (depending on brand)... /ubbthreads/images/graemlins/cool.gif
Have fun on CPF! /ubbthreads/images/graemlins/grin.gif