Light-emitting device and lighting apparatus

A luminaire comprising:

• a main body;
• and
• a light-emitting device configured to be placed in the main body, wherein
• the light-emitting device comprises a substrate, and a plurality of light-emitting elements mounted on the substrate, and
• the light-emitting elements are configured to be placed to meet conditions that the number B of light-emitting elements per unit area (cm2) of a mounting part is not less than 0.4 and a mean mounting density D is not less than 58 to not greater than 334, when the relationship of formula “D=A×B” is established, assuming D as a mean mounting density of light-emitting elements on a substrate, A as a current (mA) flowing through one light-emitting element, and B as the number of light-emitting elements per unit area (cm2) of a substantial mounting part for light-emitting elements.