Downlight and downlight wall wash reflectors

In a lighting fixture having a large-area light source and a reflector having a cutoff angle, the improvement comprising:

• first means comprising a portion of the reflector and defining a light distribution section thereof for directing light from an aperture thereof, the light distribution section having an optical contour generated by rotation about a center line of a curve defined by and points lying respectively on lines having an angle to the horizontal equal to shield angles approaching the reflector from opposite sides thereof, the lines each having an outline of the light source above said lines with the lines being tangential to said light source;
• and,
• second means comprising a portion of the reflector and defining a light concentration section which is optically joined to the light distribution section to form an optical juncture therebetween, at least portions of the light source being located within the light concentration section, for internally reflecting light produced by the light source internally of the light concentration section to concentrate said light and to direct the internally reflected and concentrated light progressively toward and past the optical juncture of the light concentration section and the light distribution section, the light so concentrated and directed into the light distribution section being directed from the aperture which is located opposite the light concentration section to illuminate surfaces of an environmental space.

In a lighting fixture having a large-area light source and a cutoff angle, the improvement comprising a reflector having a light concentration section within which at least portions of the light source are located and a light distribution section optically joined to the light concentration section, light produced by the light source internally of the light concentration section being internally reflected therewithin to the light distribution section, the light distribution section directing light from an aperture thereof opposite the light concentration section to illuminate surfaces of an environmental space, the reflector being formed with a window opening in a wall of the light distribution section, the improvement further comprising a kicker reflector carried by the reflector, portions of the kicker reflector being spaced from and being disposed in opposing relation to the window opening, the kicker reflector having light reflective surfaces formed in an optical contour opposing the window opening for reflecting light onto a vertical surface spaced from the fixture to wash the vertical surface with light, the optical contours of the light reflective surfaces of the kicker reflector aiming each bounding ray incident thereon sequentially to points along a line defined by a point disposed centrally of an aperture of the reflector and by a point below and juxtaposed to an edge of the aperture opposite a given point on which the bounding ray is incident on the reflective surfaces of the kicker reflector.

In a lighting fixture having a large-area light source and a cutoff angle, the improvement comprising a reflector having a light concentration section within which at least portions of the light source are located and a light distribution section optically joined to the light concentration section, light produced by the light source internally of the light concentration section being internally reflected therewithin to the light distribution section, the light distribution section directing light from an aperture thereof opposite the light concentration section to illuminate surfaces of an environmental space, the light distribution section having an optical contour generated by rotation about a center line of a curve defined by end points lying respectively on lines having an angle to the horizontal equal to shield angles approaching the reflector from opposite sides thereof, the lines each having an outline of the light source above said lines with the lines being tangential to said light source, the curve between the end points being derived by sequentially connecting line segments of infinitely small lengths, each line segment reflecting an incident ray of light in a direction equal to the cutoff angle defined by said lines, the angle of incidence of the ray of light being the greatest angle which intercepts the outline of the light source, any ith segment having a bounding angle dependent upon a desired number of segments and values of a right side shield angle .theta..sub.S1 and a left side shield angle .theta..sub.S2, .theta..sub.S1 being 360.degree. minus a conventional shield angle between 35.degree. and 45.degree. and .theta..sub.S2 being 180.degree. plus the conventional shield angle, values of a bounding angle of the ith segment being .theta..sub.H and wherein ##EQU8## where i=the ith segment

• n=the total number of segments in the curve,
• orientation of the ith segment then being determined by ##EQU9## wherein .theta..sub.C =left side cutoff angle=.theta..sub.S2 +2.degree.
• and wherein a line along the bounding angle and the line segment is defined by Y=mX+b and wherein the line along the bounding angle is m=tan(.theta..sub.H) and b is equal to a Y coordinate of a point at which the line along the bounding angle intercepts the outline of the light source minus the product of the slope of the line along the bounding angle and the X coordinate of the point at which the line along the bounding angle intercepts the outline of the light source, and wherein the ith segment has a slope equal to the tangent of .theta..sub.DE where ##EQU10## and wherein b is equal to the Y coordinate of a lower end point of the ith segment minus the product of the slope of the ith segment and the X coordinate of the lower end point of the ith segment, the ith segment being established as a point on the curve having an X component equal to the b value of the line along the bounding angle minus the b value of the ith segment divided by the slope of the ith segment minus the slope of the line along the bounding angle, the curve having a Y component equal to the slope of the ith segment times the X component plus the b value of the ith segment, each of the n number of the ith segments being so defined to generate the curve.

In a lighting fixture having a large-area light source and a cutoff angle, the improvement comprising a reflector having a light concentration section within which at least portions of the light source are located and a light distribution section optically joined to the light concentration section, light produced by the light source internally of the light concentration section being internally reflected therewithin to the light distribution section, the light distribution section directing light from an aperture thereof opposite the light concentration section to illuminate surfaces of an environmental space, the light concentration section having an optical contour which is frustoconical in conformation, the reflector being formed with a window opening in a wall of the light distribution section and the improvement further comprising a kicker reflector carried by the reflector, portions of the kicker reflector being spaced from and being disposed in opposing relation to the window opening, the kicker reflector having light reflective surfaces formed in an optical contour opposing the window opening for reflecting light onto a vertical surface spaced from the fixture to wash the vertical surface with light, the optical contour of the light reflective surfaces of the kicker reflector aiming each bounding ray incident thereof sequentially to points along a line defined by a point disposed centrally of an aperture of the reflector and by a point below and juxtaposed to an edge of the aperture opposite a given point on which the bounding ray is incident on the reflective surfaces of the kicker reflector.