Dear, I bought an Petzl headlamp with three leds two years ago. I used it no more than 100 hours, but suddenly while I was using it and without any knock or shake, the light beam became completly focused in the middle in one point. I thought it was due to the batteries but I changed them for new ones and the light was still concentrated. It looks like the picture in your web page of Irregular beam but still more concentrated. I don't know if the leds are broken or what is happening. Thanks, Jose Luis Bayo