Light-receiving apparatus with cycle setting according to illumination categories for updating luminance value

A non-transitory computer readable medium storing program code for controlling a light-receiving apparatus, the program code being executable to perform operations comprising:

• determining a number of times of incidence of a photon to a light-receiving element has been detected within an exposure period and outputting a counted value;
• updating a luminance value;
• setting a cycle of updating time information during the exposure period, the cycle being one of a plurality of cycles corresponding to illumination categories;
• and
• acquiring, when the counted value reaches a threshold before the exposure period elapses, the luminance value that corresponds to a reach time at which the threshold had been reached, the reach time being based upon the time information.