Patent ID: 7911699

Claim:
An illumination system comprising: a light source for emitting light, the light emitted from the light source including at least visible light and ultraviolet (UV) radiation; a diffuser positioned so as to receive light from the light source, the diffuser diffusing visible light received from the light source; and wherein the diffuser comprises a glass substrate that supports a UV blocking coating so that the diffuser has a T UV (UV transmission) of no greater than about 5%; wherein the UV blocking coating is located on an etched surface of the glass substrate and comprises an organic UV blocking material in a silane-based matrix and includes particles in the matrix, the particles diffusing incident visible light from the light source, said particles consisting of TiO 2 particles and SiO 2 particles, and wherein the particles make up by weight from about 1 to 20% of the UV blocking coating, and wherein there is more TiO 2 than SiO 2 by weight.