US Patent 6971772 Luminaire globes having internal light control elements
Patent 6971772 was granted and assigned to Acuity Brands on December, 2005 by the United States Patent and Trademark Office.
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Luminaire optical assemblies intended for pole-mounted and similar applications and capable of effective I.E.S. cutoff performance while exhibiting desirable light distributions even with vertically oriented lamping, the invention contemplates in primary embodiments light-transmissive reflector/refractor combinations typically formed of glass, acrylics and the like, uplight shielding and reflector assemblies of a variety of configurations being disposed within the reflector/refractor combinations to produce desired cutoff characteristics while preserving daytime appearance during nocturnal operation. In certain embodiments of the invention, uplight is controlled by the several variations of the uplight shielding and reflector assemblies to cause light-transmissive portions of the reflector/refractor combinations to subtly glow and thus produce a desired appearance while also producing cutoff characteristics necessary to reduce urban sky glow and glare. The luminaire optical assemblies further permit achievement of I.E.S. cutoff with vertical tamping while maximizing efficiency.
US Patent 6971772 Luminaire globes having internal light control elements
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