Provided are an illumination device and a light fixture including the illumination device. The illumination device includes a body formed of a thermally- conductive material that includes a planar heat transfer surface and a fastener that is compatible with a base that couples the body to the light fixture. A substrate formed, at least in part from a dielectric material supports an array of light emitting diodes and a plurality of contacts electrically connected to the light emitting diodes. A thermally- conductive planar surface is provided to the dielectric material of the substrate to be placed in thermal communication with the heat transfer surface and conduct heat generated by the light emitting diodes to the body.