This Aluminium PCB is very flexible. It is designed to take 7 leds, with 3.45 × 3.45mm base, so will suit Cree XPG, XPG2, XPL, XHP35, Nichia NVSL219 and numerous other 3535 leds with the same base dimensions. The board layout is such that the 7 leds can be driven in Series, Parallel and Individually addressed