A light emitting device having an hermetically sealed package that includes a light source positioned in a metal can container on which is placed an optically-transparent cover. An enclosed space formed by the metal can container and the optically-transparent cover may be filled with an inert, heat-conducting gas or liquid and the inner surface of the metal can container may be coated with a high-reflector material that prevents absorption of the light emitted by the light source. A method of producing a light-emitting device having an hermetically-sealed package and a method of dissipating heat from a light-emitting device having an hermetically-sealed package is also provided.