I'm hoping to modify a 4D maglite into a quad cree light in the coming weeks and so far, I think I've got most of the supplies I'll need to do so. I've got my heatsink (PXR-19De), reflectors (McR-19XR) and emitters (Cree XR-E), but I'm having a hard time picking out the driver. One of my biggest problems is understanding the math that goes on when selecting a driver. I'll tell you now that most of it is gibberish, though I can understand bits of it. So guys, can you guys help me figure out what I need to know to select a driver?