I am not intimately knowledgible about your specific model, but I have a 6P.
On many of SureFire products, you can buy a replacement LED head that lengthens the life of their batteries.
I use the brightest bulb they make in my 6P, because I figure when I need it, I'll really need it.
But I do own the KL3 head if I know in advance I'll be utilizing it for extended period.
I'm going to buy a KL1 head for my E1e very soon. Right now, I carry thatmodel in my pockets as an EDC.
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