Patent ID: 8269427

Claim:
An illuminating device comprising: a storage unit configured to store a conversion table in which an output current command value is matched with each brightness command value which is an inputted command value of illuminance; a light source; and a control unit including: a calibrating output unit configured to read from the conversion table an output current command value corresponding to a specific brightness command value, and configured to output the output current command value to the light source; a ratio calculating unit configured to calculate a ratio between the illuminance of illuminating light emitted from the light source and a prescribed illuminance value prescribed for the specific brightness command value, when the output current command value read by the calibrating output unit is outputted to the light source; an illuminance calculating unit configured to calculate each illuminance when each output current command value matched with each brightness command value is outputted, from each prescribed illuminance value prescribed for each of the brightness command values and from the calculated ratio; and a calibrating unit configured to calibrate a relationship between each brightness command value and each output current command value in the conversion table on the basis of the relationship between each output current command value matched with each brightness command value and each of the calculated illuminances, such that each illuminance at the time when each output current command value matched with each brightness command value is outputted is set to each prescribed illuminance value prescribed for each of the brightness command values.