JohnN....I just replaced an XM L2 module in a Solar Force L2M with the lower power option (.8 to 4.2v) XP-G module which has a low voltage shut down circuit for use with Li-ion 18650s...with a smooth reflector, this has become one of my favorites...
I find the XPG to be a good option. Bright but not too power hungry which means it doesn't need a fancy driver or heat handling. Decent focus with a smooth reflector or soft focus with an orange peel reflector.
The high power LEDs need high end drivers and heat handling and you really have to shop around for someone who builds them right for it to take advantage of the LED and be reliable. And then you are going to pay a fair amount.
The high power LEDs also require better batteries.
I do have a few high power modules, but reserve them for specific applications.
-john
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