A lighting apparatus includes: a light source unit configured to emit first light and second light by sequentially switching between the first light and the second light； a light-receiving unit configured to receive the first light with first light-receiving sensitivity and output a first light detection signal and receive the second light with second light-receiving sensitivity and output a second light detection signal； a multiplication unit configured to generate a first multiplication signal and a second multiplication signal, where the first multiplication signal is obtained by multiplying the first light detection signal by a coefficient set according to the first light-receiving sensitivity and the second multiplication signal is obtained by multiplying the second light detection signal by a coefficient set according to the second light-receiving sensitivity； an integration unit configured to integrate at least one of the first and second multiplication signals for a predetermined period； a judging unit configured to judge whether or not integration results exceed a threshold for judging a condition of the light source unit； and a control unit configured to control at least one of the first and second light sources based on a judgement result.
