Light projecting device

A light projecting device configured to be mounted on a vehicle and used in combination with a camera having sensitivity to a predetermined wavelength range, the light projecting device comprising:

• a light projector having a light-emitting diode and configured to illuminate an area around the vehicle with light;
• a controller configured to control lighting of the light projector;
• and
• a measuring device connected to the light projector and configured to measure a junction temperature that is a sum of a heating temperature of the light projector and an ambient temperature of an area around the vehicle,
• wherein the controller is configured to:
• execute a control to heat the light projector when the junction temperature measured by the measuring device falls below a temperature range preset in accordance with the sensitivity of the camera, and
• execute the control to dissipate heat from the light projector when the junction temperature measured by the measuring device exceeds the temperature range.