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(57) ABSTRACT A illumination Source comprising (i) a light emitting device,(ii) at least one photoluminescent material layer, and (iii) a filter between the light emitting device and the photolumi nescent material layer. The light emitting device may com prise one or more LEDs, one or more lasers, one or more laser diodes, one or more lamps, or a combination of these things. The photoluminescent material layer may comprise quantum dot material and/or phosphors, and it may absorb light emitted from the light emitting device and convert the wavelengths of at least a portion of the photons emitted from the light emitting device to longer wavelengths. The filter may be substantially transmissive of light emitted by the light emitting device and substantially reflective of light emitted by the photoluminescent material layer, which may be omnidirectional. That way, light emitted from the light emitting device and the …