Now that I've shifted slightly to the dark side and have invested in an 18650 and LED upgrade for my SF 6P, I added to it by ordering a ThruNite TN12 (neutral white). The neutral white version is supposedly 20% less out the front as cool white, so this one should max out at 840 lumen (Turbo), 296 lumen on high and 116 lumen on medium if my arithmetic is correct. The numbers advertised are for the cool-white version and are higher.

The TN-12 had good reviews on Amazon; I'll let you know how it feels and if I notice any issues once it arrives.