I have a Petzel Zoom and would love to convert it.
How's it going ?
Converting it is like a 10 second job. If you don't mind the ringyness the headlamp is quite useful and lights up much better then it originally was.
Last weekend I went camping took this big headlamp only and the weather was around 15-20C. I pulled open the reflector to check how hot the slug was and it wasn't hot at all, it seems the plastic on the original holder was enough to dissipate the heat when it was this cold. And battery life was great cause I never changed my 2100mah's for the two evenings and I had it on for awhile. It's not regulated but with the use of rechargeables and their properties, it's battery regulated anyways.
Also with the focusable reflector I was able to turn it into a very tight beam that actually lit up very far. Side spill was great on this lamp.
In the end i'll probably use this one again over my 3aaa 1 watter headlamp. Just cause I look like a miner and 3aa's has a much larger capacity so I don't have to worry about batteries at all on a weekend trip, while my 3aaa one dies in 1-2 hrs.