摘要:
A luminaire has a brightness reduction cover element below and in proximity to the active light source of the luminaire to simulate a larger light source having a lower surface brightness which is exposed through the luminaire's down light opening. For example, where the luminaire has a high output T5 lamp, the brightness reduction cover element can be in the form of a substantially semi-cylindrical opal diffuser cover strip sized to simulate a T8 or T12 lamp. An opal diffuser cover strip having two side-by-side arcuate portions joined at opaque interior edges can be positioned under two side-by-side T5 lamps to simulate side-by-side T8 or T12 lamps. For a direct-indirect luminaires the brightness characteristics of the exposed light source is governed by the lower brightness mock light source, while the uplight distribution of the luminaire is produced from the higher intensity light emitted from the top surface portions of the T5 lamp (or other active light source) for maximum control over the indirect lighting component of the luminaire.
摘要:
A luminaire 11 has baffle elements 31 in the down light opening of the luminaire's housing 15 for shielding the luminaire's light source 27 from direct view at normal viewing angles S. The bottom edges 51 of the baffle elements are provided with visual accent areas 55 which, at shielded viewing angles, exhibit relatively high observable brightness as compared to the relatively low observable brightness of the baffle elements' reflective surfaces 53. The visual accent area of the baffle elements is relatively small as compared to the baffles' reflective surfaces so as to produce a visual accent without visual discomfort associated with direct and reflected glare.
摘要:
A method for indirectly illuminating an interior space is disclosed wherein a laterally extended overhead distribution of light is produced from a source of indirect lighting, such as a fluorescent indirect luminaire, by directing a portion of the source light upward to produce a luminance pattern on the ceiling surface directly overhead and then refracting substantially all of another portion of the source light laterally of the indirect luminaire so as to spread the refracted portion away from the directly overhead luminance pattern. Illustrated is a luminaire having trough-shaped lensed for achieving the method of the invention wherein the lateral portions of the lens act to refract the light laterally as above described, and the top lens portion is formed to diverge the light incidence thereon directly overhead in a substantially uniform luminance pattern which is extended by the light refracted through the lateral lens portions.
摘要:
An indirect lighting system having a generally visible light transmissive element, such as a prismatic lens element or a diffuser strip, which modifies the direction of the light incident thereon from a secondary light source. The lighting system has a primary light source and structural means for positioning the primary light source proximate a reflective surface which reflects light back toward the light transmissive element and which thereby acts as a secondary source of light for illuminating this element. A light foil means is disposed between the primary light source and light transmissive element for substantially blocking direct transmission of light to the latter from the former. The light foil means, by keeping primary source light from directly striking the light transmissive element, forces the observable brightness in this element to be induced substantially entirely by the reflected light from the secondary source.
摘要:
A linear light passing media, typically a linear prismatic lens or a linear diffuser strip, is provided with linear areas of coloration to give a striped effect to the media. Color or neutral stripes are provided to areas of the media that are observable by persons standing in the vicinity of the lighting fixture; they act to give the media a psychological pleasing appearance, or on linear prismatic lenses, to mask out bright strips on the prismatic surfaces or at the base of the lens.