Patent ID: 6457845
Filing Date: 2002-10-01
Classification: F21V

Abstract:
A luminaire comprising:a high-intensity gas discharge lamp subject to non-passive failure and thereby producing hot debris; an enclosure for said lamp, said enclosure including an open end oriented generally downwardly, and a transparent closure made of a combustible polymeric material covering said open end, said transparent closure having an ignition-resistant interior surface facing said lamp, wherein said ignition-resistant interior surface includes a coating disposed on said interior surface, said coating being at least one of (i) a layer of silicone hardcoat or (ii) a layer of silicon oxynitride having a composition SiOxNy, with x in the range between about 0.1 and 0.9 and y in the range between about 0.1 and 0.09, and a silicone hardcoat layer is disposed between said interior surface and said silicon oxynitride layer; and wherein, in the event of non-passive lamp failure, said transparent closure contains the hot debris and said ignition-resistant interior surface fails to ignite when contacted by the hot debris.