Fireclaw18, the Fc versions deliver an egg curved cone of light that keeps maybe 70% of the intensity of the hotspot while spreading and smoothing the light across center of focus and into periphery.
Fc is the one that stays in my pocket, my original spot&fill model is relegated to spare, and my pure flood stays in the headband and gets used for work.
I got to use an AA powered Fc that I gave to a friend and it delivered good, usable light over a dinner plate size area at arms length with much less power than my pure flood 602w.
If I were typically working on small projects in close areas then Fc would be just as good or better than full flood, messing with wiring, under a vehicle, etc.
The pure flood is great for limited range spatial awareness, chaotic work environments, but so wasteful when you need a task light on your head.
The 602w really is my least favorite ZL, still the best one for wrapping up jobs in the dark, climbing ladders, avoiding head bumps and finding tools.
When I get a 600Fc MK IV I'll try the old 600Fw MK II as a work headlight again, it's too good though as a pocket light to keep putting the headband on and off, especially with the pocket clip complicating the headband attachment process.