| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device capable of achieving backward light distribution.SOLUTION: In a lighting device, a radiator has a polygonal columnar shape with at least three side faces and is provided with: a member which is arranged on the radiator and of which the side faces are inclined at a prescribed angle in a direction toward a center of the radiator; and a light source portion arranged on at least one side faces. The light source portion is provided with a substrate, two or more of light-emitting elements arranged on the substrate so as to be symmetric with a center of the substrate as a reference, and two or more lens portions arranged on each of the light-emitting elements. With this, a backward light distribution standard (Energy Star) and ANSI standard of the United States are fully satisfied and backward light distribution characteristics are greatly improved and a dark part can be removed. |
