Patent ID: 8390193

Claim:
A light emitting device comprising: a thermally conductive substrate; at least one light emitting diode chip mounted in thermal communication with a surface of the substrate and operable to emit excitation light having a dominant wavelength in a first wavelength range; a non-transmissive housing attached to the substrate and configured such that the housing and substrate together define a volume that totally encloses the at least one light emitting diode chip; a substantially planar window attached to the housing, wherein the substantially planar window and the housing are separate components; a hermetic seal formed between the substantially planar window and the housing; at least one phosphor material provided on an inner surface of the window within said volume, said phosphor being operable to absorb at least a part of the excitation light and to emit light having a dominant wavelength in a second wavelength range; and a second hermetic seal formed between the housing and the substrate; wherein the volume defined by the housing and the substrate that encloses the at least one light emitting diode chip is isolated from an environment by the second hermetic seal formed between the housing and the substrate and the hermetic seal formed between the substantially planar window and the housing.