This one has had 5X5mm leds which light output was awful.Now has a XR-E Q3 with an AK-47 driver with 2 MC7135 , 700 mA at H...the emitter is thermally glued to a 2mm thick aluminum piece...the light now is very usable despite the blueish tint...first tried with an Osram diode warm tint 1 MC , 350 mA, as the difference in output is not very noticeable this mod would last until the hardware store open, need some glue sticks to put a lens and swap the emitter again 
The innards with the 10440 and the driver
Very nice mod arenat.
Don wrote:
"But as I said long ago, you are more likely to be killed by a dead fish dropped by a seagull in the Sahara Desert than by a lithium ion
Good idea!
Keep up the good work!
The numbers from my light tests are always to be found here.
https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...
Thanks guys!
Another try,with some lens unknown angle sanded down , nice warm tint, Osram...
Being the package of the diode square I cut his angles to fit the lens , the beam is narrow, maybe too narrow for a headlamp..
Finally with a bit of work the result is fine, better than expected.
Emitter ; Osram Golden Dragon Warm tint 120 Lumen
High .700 A
Med .200 A
Low .035 A
Power; 10440 li-ion
Slide switch
Rear magnet
Weight; 34 grs With battery..
The low mode is enough to read and the high is a bit too much for close work, the sanded lens give a very even nil artifact flood spot.
The only problem is that I can't find the band