So I was wanting to get a headlamp for my dental loupes but I was too cheap to cough up the 800-1200$$ for one made by the big Dental manufactures so I decided to make one out of a P1. The body of the light now made out of Silver which makes a great heatsink. It will run continuously and only gets about half as warm as the origional aluminum body. The battery pack runs off of two AA's and will last about 3 hours or so if on continuously. My only complaint is that the Cree PI came out a month after I built this light. Looks like I may need to make a few more mods.