There are a couple of things that worry me about the suitability of using the ALF as a headlamp...
1) Beam angle is relatively narrow... 12 degrees spot, and 53.5 degrees spill. I'm concerned the tight beam might produce tunnel vision.
2) No medium output level... 6 lumens and 110 lumens on the AL works fine due to dispersed/mule beam profile, but I'm afraid that 110 lumens through the ALF's tight reflector will be too bright for many general headlamp uses.
On the plus side, the ALF can be rapidly swapped with the AL as needed, since both use the same 360 headband adapter bit and magnetic attachment. And I'm sure that there won't be any mode skipping, PWM flicker visible in the rain, etc.
By comparison, the Mini ML-X has what seems (on paper anyway) like a better beam profile for this use...
1) 15 degrees spot and 82 degrees spill.
2) 54 lumens mid mode seems like a good level for general headlamp use... (though 252 lumens max mode is way beyond what I'd need).
Additionally, the Mini is only 2/10ths of an inch longer than the ALF but weighs half as much, so comfort is likely to be at least marginally better.
So I'm sort of torn between these two options. Those who have both, which would you have for headlamp use?