On the KL6, you can increase the current from the "conservative" stock value of about 665mA, to a 1A or 1.2A current by modifying the resistors in the stock circuit, but you do it at your own risk since that would probably dramatically reduce the life of the LED given the increased heat /ubbthreads/images/graemlins/mad71.gif
So you can increase the current to 1.2A to gain approx 50% more light but might kill the LED /ubbthreads/images/graemlins/banghead.gif
The only good thing about this "mod" is that the KL6 head is a HUGE heat sink /ubbthreads/images/graemlins/naughty.gif
Will