Abstract: A LED (Light Emitting Diode) substrate and packaging for a single diode or a diode array is described. The substrate includes an integral reflector(s) for the diode(s) in the form of a shaped cavity (or cavities) to house the diode die(s). The reflector cavity walls can optionally be plated with a reflective material and may include a molding material to serve as lens and sealant. Also described is a method for building a substrate with direct metal connection of low thermal path between a die and a bottom surface of the substrate. Another embodiment is for two electrical traces crossing each other without the need for a two layer interconnect structure. The substrate and reflector structures are built of aluminum-aluminum oxide composition applying a technology known in the art as ALOX technology. The resulting substrate and packaging afford the required electrical interconnections and enhanced thermal performance while maintaining excellent mechanical properties.