Light-emitting apparatus with inclined light-emitting units

A light-emitting apparatus comprising:

• a rectangular substrate;
• a plurality of light-emitting units each having a plurality of LED elements mounted on the substrate in a rectangular lattice pattern, wherein each of the light-emitting units has a rectangular light-emitting region, and the light-emitting units are arranged in a rectangular lattice pattern including at least two columns and at least two rows that are parallel with sides of the substrate;
• and
• a lens array including a plurality of lenses provided corresponding to the light-emitting units, respectively, the lens array being arranged on the plurality of light-emitting units, wherein
• the plurality of lenses is designed such that beams of emission light from the plurality of light-emitting units are collected and radiated so as to overlap with one another at a position distant from the substrate,
• a first subset of the plurality of light-emitting units arranged at a first angle with respect to a reference direction in a plane of the substrate, and
• a second subset of the plurality of light-emitting units arranged at a second angle with respect to the reference direction in the plane of the substrate, the second angle being different than the first angle,
• wherein each of the at least two columns and each of the at least two rows includes at least one light-emitting unit of the first subset and at least one light-emitting unit of the second subset,
• wherein the plurality of light-emitting units is arranged on the substrate such that centers of the respective light-emitting units are arranged at equal intervals, and
• wherein the rectangular lattice pattern, the first angle and the second angle of plurality of light-emitting units are predetermined such that the beams of emission light overlap to produce an approximation of a circular shape at the position distant from the substrate.