Lighting apparatus and illumination system using the same

A lighting apparatus comprising:

• a power supply unit configured to supply lighting power to a load comprising a light-emitting element;
• and
• a control unit configured to control the power supply unit such that, when a command value that is provided from outside changes, a light quantity and a color temperature of the load change according to a first output characteristic defining a correspondence relationship of a plurality of command values to a plurality of light quantities and a plurality of color temperatures,
• wherein the control unit, at a time of activation of the lighting apparatus, determines a first color temperature of the load at an initial stage of lighting based on a command value that is set in advance before a start of activation of the lighting apparatus, and controls the power supply unit such that the light quantity and the color temperature of the load change according to a second output characteristic during a period in which the color temperature of the load changes from the first color temperature to a second color temperature, in the first output characteristic, corresponding to the command value set in advance, and
• a correspondence relationship between a plurality of light quantities and a plurality of color temperatures defined by the second output characteristic is different from the correspondence relationship defined by the first output characteristic.