Horticultural luminaire with a downward batwing light distribution

An intra-canopy horticultural luminaire (100) for illuminating a portion of a crop having a vertical height that is measurable along an axis that is substantially vertical to ground level, the horticultural luminaire comprising:

• a solid-state light source (2) disposed on a substrate (4) and located within a housing (6);
• a lightguide (40) having a first longitudinal edge (42) and a second longitudinal edge (48) positioned opposite the first longitudinal edge;
• the lightguide having a longitudinal axis (L) extending along its major length dimension, the lightguide further having a width (W) in a lateral direction along a width axis (X) perpendicular to the longitudinal axis (L);
• the lightguide defining at least one emission face (44;
• 46) extending between the first and second longitudinal edges, the at least one emission face extending away from the light source;
• the lightguide being optically coupled to the light source at the first longitudinal edge, the lightguide receiving a portion of the light emitted from the light source and transmitting that light therethrough, the lightguide altering an angular path of the transmitted light along a forward direction (V);
• wherein the lightguide has a light output that includes the transmitted light from the light source;
• wherein the at least one emission face of the lightguide comprises optical extractors disposed, along a vertical height in the forward direction (V), from a region proximal the first longitudinal edge (42) and extending toward a region proximal the second longitudinal edge (48), such that the light output of the lightguide is output over a major portion of the vertical height of the at least one emission face, and the light output of the lightguide has two downwardly directed angular peaks on opposite sides of the vertical direction (V), has a value below the peak values along the vertical direction (V), and has decreasing values at angles above the angular peaks;
• and
• wherein the angular peaks are at about plus 30 degrees and at about minus 30 degrees away from the vertical direction (V).