I made two one with a 2.8 amp driver and a 3C tint XML on a 16mm star and it was very bright with lots of flood and another with a 2.1 amp driver and a Nichia 219 on a 10mm star it was also very bright with a lot of throw.
Use lots of flux to get the driver to stick to the pill otherwise the build is rather easy. Here is some more info. PS jacktheclipper has a 3.5 amp 3C tint XML monster I made him that he absolutely loves to death.