Petzl Duo LED Headlamp

[tygger]

just bought this headlamp. should be on petzl or REI website. has one halogen bulb and 3 LED's, runs on 4AA's, is waterproof, and rated for haz mat use. 3 LED's can be replaced by 5 LED assembly or a low watt bulb. very well built i must say. anyone else own one? would love to get some feedback. seems like the most durable, best all around LED/incandescent headlight out.

 

[Chuen]

Is the 5-LED assembly also from Petzl? Do they used voltage regulation on the LED?