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mrme said:...BD headlamps have a nicely designed switch, are at least as bright, are lighter and require one battery fewer. For running an LED, why use 4 batteries and a bigger resistor?...
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They may have had in mind the fact that the batteries can be better drained (go to lower voltage) with the LEDs still able to light. Personally, I find 4AA on the back of my head to be a bit much. Since I also like to have a red LED on a headlamp, I can always switch that on to suck the batteries down more. This is atleast helpful in real darkness.
I don't currently have any Petzl headlamps, but I did buy a Myo 3 about a year ago, I think, and returned it. That's not unusual for me, because I do that with a lot of lights. There were things I liked about it, and things I didn't. I thought the battery case and wires were well designed. But I thought the head was too big for my tastes, and I didn't like the bright colors of the whole thing. At the time that was a big issue with me, since I often used a headlamp to walk through a crime laden park, and needed to maintain some stealth ability. For that, the best thing you can do is shut the darn thing off altogether, and have dark colored clothing.