1. An illuminating optical device comprising:
a plurality of light source units that each emits a different color of light;
a color wheel that includes a plurality of transmissive regions that each transmit the different color of light and that moves
a point on which incident light from each light source unit falls, over the transmissive regions as the wheel rotates;
a storage that stores a plurality of lighting pattern information items, each item indicating a lighting pattern to turn on
each light source unit in a different period of lighting; and,
a controller that receives a select signal for selecting one of the multiple lighting patterns to turn on each light source
unit in accordance with the lighting pattern information item indicating the lighting pattern selected by the select signal.