ixfd64
Newly Enlightened
I was looking at the Quark Pro QP2A and the Quark Pro QP2A-X from FourSevens, and one thing that caught my eye was the huge difference in maximum run time. Both of these lights use two AA batteries and have the same minimum output of 0.2 lumens, yet the maximum run time for the QP2A-X is only 360 hours, compared to 720 for the QP2A (even though it's still a lot). What accounts for the discrepancy?