In reply to Gazoola's PM:
Our modded TIKKA Plus light is still working fine, though it gets somewhat less use of late. No real test data, just that it is definitely brighter, whiter, and runs a good long while between battery changes.
Changing the resistor may well get you into the sweet spot for running the LEDs at spec., but most reputable manufacturers (Peak, ARC, etc.) seem OK with overdriving them. IIRC, the ARC AAA is run at about 45mA. Also, being direct drive, won't the LEDs initially be overdriven, then as the batteries drain drop through the sweet spot, and eventually be under-driven as they tail off?
My assumption in simply swapping LEDs with no other changes is based on the repeated mantra that Nichia makes the toughest LEDs on the market, probably tougher than the LEDs Petzl originally put in the light, so a bit of abuse wouldn't be a problem. Overdriving will give more light, cause some color shift (toward blue?), and hasten the demise of extremely long lived LEDs.
Smoke 'em if you've got 'em …