I just went looking for it, but it is somewhere with the rest of my climbing gear that I still have. Probably find it tomorrow. I will say that it was not a LED , but was bright and had about a 2" Lens and Bezel. Then on the back of the head harness was the battery back. The Battery was about 2 1/2" x 2 1/2" and lasted forever. It was the Light that is used on climbing Mt. Everest and all the BIG Mts. That was years ago and now they use LEDs.Which Petzl Head Lamp model did you use?