Didn’t you already ask this? http://www.backpacking.net/forums/showth...5&o=186
Or did you want a more general audience response?

And I hear you on it being regulated. It’s nice not having the light go dim immediately after putting batteries in. Plus the single cell lights are lighter and end up being more efficient.

And I’m waiting for something like my Fenix L1D (single AA, 80 lumens, not flood) to be put in headlamp mode. For now I just clip it to my ball cap.

-Barry