Patent ID: 7728499

Claim:
A high intensity gas discharge lamp, said lamp comprising: an elongated light-emitting discharge vessel having a wall formed of a ceramic material, said vessel having central portion enclosing an interior space, and first and second end portions; an ionizable dose within said interior space; first and second discharge electrodes positioned within the vessel proximate said first end portion and said second end portion, respectively; wherein said lamp further comprises at least one adherent infrared reflective coating layer located on the outer surface of the vessel proximate the first and second end portions, said coating layer comprising a nonmetallic material, said nonmetallic material selected from the group consisting of titanium oxide, tin oxide, hafnium oxide, aluminum oxide, zinc oxide, magnesium oxide, a lanthanide oxide, barium sulfate, and mixtures thereof; wherein said coating layer substantially does not undergo deterioration in infrared reflectance capability after thermal cycling to 1000° C. for at least 500 hours.