Yep, I have a few FourSeven lights myself. What they now refer to as the Quark Pro QP2A is IMO one of the best all-around lights on the market. 2xAA batteries and light output from moonlight (0.2 lumens) to fairly bright at 205 lumens. The 1xAA version (max of 109 lumens) is clipped inside my EDC backpack. I use lithium primary batteries in these lights. One of their brighter 2x123A tactical versions (Quark Pro QP2L-X) is in my survival vest.

No affiliation.
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Better is the Enemy of Good Enough.
Okay, what’s your point??