This is a copy of a message I posted on another thread:
Re: Sure, Surefire is going Cree... but when?
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What shall I do with my old 6P fitted with KL3? I was in Hong Kong and bought 2 Cree lights made by UltraFire in China, one running on 1x18650 (also takes 2x(3.7v)123A rechargeables) and the other running on 2x18650. In fact both are the same light just that the tube on one is longer. These are both very well finished. Perhaps just marginally below the standard of finish of the 6P. But when it came to performance. Yes, you have got it. I need say no more. The Crees are whiter and brighter. The 6P can only take 17670 as the tube is not wide enough. Also, 18650s are 2400mah but 17670 only 1800mah. I can see that soon many Luxeon lights will have to find new homes or enjoy a long hibernation! The 6P has been with me for over 10 years since its incand days.
I also bought another light with a 3W LED (also running on 1x18650) which has got "Seoul LED" printed on the LED. This also out-performed the Luxeon and about equalled the Cree.
Unless SF took some drastic actions soon, the market will move away from them.
I forgot to mention. All 3 lights together cost less than the KL3 attachment alone!