Have had mine for some time, never have...
Have had mine for some time, never have had to change the bulb. I have no paperwork and can't get mine to open. How do you change the bulb?
Looks like you twist the front, pop the lens out, change the bulb, and then put it back together in reverse.
Here's the paperwork: http://www.petzl.com/files/all/technical-notice/headlamps/E69P%20DUOLED5%20E69500-L%20.pdf
I'm sure it'll make more sense to you than me, since you're familiar with the light.