Control device for illumination device

A control device for an illumination device, the control device being configured to control a plurality of illumination devices each capable of setting a light distribution shape of light emitted onto a virtual plane in two directions of a first direction and a second direction intersecting the first direction, by adjusting a diffusion degree of light emitted from a light source, the control device comprising:

• a touch sensor having a detection region provided with a plurality of detection elements;
• and
• a display panel provided with a display region that overlaps the detection region of the touch sensor in plan view and configured to display, in the display region, an adjustment screen provided with an adjustment region for adjusting the diffusion degree of each illumination device, wherein
• the control device is configured to:
• acquire a target diffusion degree corresponding to a touch detection position in the adjustment region;
• and
• execute
• coarse adjustment processing of adjusting the diffusion degree of the illumination device to be close to the target diffusion degree in steps of a first adjustment interval,
• matching processing of matching the diffusion degree of the illumination device to the target diffusion degree, and
• fine adjustment processing of adjusting the diffusion degree of the illumination device to be close to the target diffusion degree in steps of a second adjustment interval smaller than the first adjustment interval, and
• the control device is configured to:
• execute processing of calculating a diffusion degree difference value that is a difference between the target diffusion degree and a diffusion degree display value corresponding to a position on the display panel corresponding to the current diffusion degree of the illumination device;
• and
• execute any of the coarse adjustment processing, the matching processing, and the fine adjustment processing depending on the diffusion degree difference value.