A luminaire comprising: at least one light guide (100, 200, 300, 400, 550) comprising: an elongated base (112, 212, 312, 412) comprising a light emitting surface at a distal end, and opposing major faces (126, 126'); and a plurality of collimators (110, 210, 310, 410) arranged in an adjacent manner and projecting in a proximal direction from the base, wherein each collimator comprises a light receiving surface (114, 214, 314, 414) at a proximal end, wherein each collimator expands laterally outwardly in a distal direction, and whereby substantially all light received at the light receiving surfaces internally reflects through the collimators and the base and emits from the light emitting surface; a plurality of light sources in optical communication with the light receiving surfaces; a board onto which the plurality of light sources are mounted; and a housing for housing the light guide, the plurality of light sources, and the board, wherein the housing comprises opposing sidewalls that distally extend beyond a plane defined by the light emitting surface, characterized in that a first angle defined by the first faces of the collimators relative to a plane (122, 222, 322, 422) defined by the light receiving surfaces of the collimators ranges from 82 to 89.9 degrees, or from 80 to 89.9 degrees, or from 75 to 89.9 degrees, and wherein a second angle (120, 220, 320, 420) defined by the second faces of the collimators relative to a plane defined by the light receiving surfaces of the collimators ranges from 80 to 89.9 degrees, wherein the first angle and the second angle are different. at least one light guide (100, 200, 300, 400, 550) comprising: an elongated base (112, 212, 312, 412) comprising a light emitting surface at a distal end, and opposing major faces (126, 126'); and a plurality of collimators (110, 210, 310, 410) arranged in an adjacent manner and projecting in a proximal direction from the base, wherein each collimator comprises a light receiving surface (114, 214, 314, 414) at a proximal end, wherein each collimator expands laterally outwardly in a distal direction, and whereby substantially all light received at the light receiving surfaces internally reflects through the collimators and the base and emits from the light emitting surface; an elongated base (112, 212, 312, 412) comprising a light emitting surface at a distal end, and opposing major faces (126, 126'); and a plurality of collimators (110, 210, 310, 410) arranged in an adjacent manner and projecting in a proximal direction from the base, wherein each collimator comprises a light receiving surface (114, 214, 314, 414) at a proximal end, wherein each collimator expands laterally outwardly in a distal direction, and whereby substantially all light received at the light receiving surfaces internally reflects through the collimators and the base and emits from the light emitting surface; a plurality of light sources in optical communication with the light receiving surfaces; a board onto which the plurality of light sources are mounted; and a housing for housing the light guide, the plurality of light sources, and the board, wherein the housing comprises opposing sidewalls that distally extend beyond a plane defined by the light emitting surface, characterized in that a first angle defined by the first faces of the collimators relative to a plane (122, 222, 322, 422) defined by the light receiving surfaces of the collimators ranges from 82 to 89.9 degrees, or from 80 to 89.9 degrees, or from 75 to 89.9 degrees, and wherein a second angle (120, 220, 320, 420) defined by the second faces of the collimators relative to a plane defined by the light receiving surfaces of the collimators ranges from 80 to 89.9 degrees, wherein the first angle and the second angle are different.