Thanks Sashix and Match. I dont really want or need a pencil beam light but if all goes well the weekend looks more exciting than it was. Match This will be going on a copper pill similar to my HD-2010 2 x 26650 battery mods https://budgetlightforum.com/t/-/9637 . What amps would you start at. I would be using a kd 3040 amp or 2.8 amp 7135 driver. I would have to take of chips to reduce the amperage.