Illumination device, an image acquisition system and the illumination control method

An object of the present invention is to reduce unnecessary lighting time of the lighting device. Lighting device 10 of the A embodiment, a LD14a used as a light source, and the terminal of the connector 11 to enter the lighting control signal LDG for instructing turning on and off of the LD14a from the imaging device, according to the lighting control signal LDG LD14a an LD driver 13 for driving and a comparator in determining the LD driving unit 13 whether the reached brightness brightness LD14a is specified, the brightness of the LD14a reaches a designated brightness comprises a terminal of the connector 11 for outputting a lighting signal LD_ON indicating that LD14a is turned to the imaging apparatus. .The