A lighting apparatus includes: a light source unit configured to emit first light and second light； a light-receiving unit configured to output a first light detection signal having strength corresponding to first light-receiving sensitivity and an incident light quantity of the first light and a second light detection signal having strength corresponding to second light-receiving sensitivity and an incident light quantity of the second light； a calculation unit configured to generate a first multiplication signal by multiplying the first light detection signal by a first coefficient and generate a second multiplication signal obtained by multiplying the second light detection signal by a second coefficient； and a control unit configured to control the light source unit so as to decrease a light quantity based on the first multiplication signal or second multiplication signal.
