Apparatus for providing energy to a process chamber are provided herein. In one embodiment, the apparatus include a supporting substrate, a first plurality of solid state light sources disposed on a first surface of the supporting substrate, and a second plurality of solid state light sources disposed on the top surface of the supporting substrate, wherein the first and second plurality of solid state light sources are aligned and electrically isolated from each other, and the first plurality of solid state light sources is in physical contact with the second plurality of solid state light sources.