1. A luminous intensity compensator, comprising:a light source;
a sensor, configured to receive sensor information representing a position of the light source, and to output sensor data representing the position of the light source;
one or more processors, configured to:
determine from the sensor data a distance between the light source and a reference point;
determine a loss factor of a wavelength based on the determined distance between the light source and the reference point;
determine a compensated luminous intensity to yield a target luminous intensity of the wavelength after luminous intensity reduction due to the loss factor;
output control data to control the light source to emit the wavelength at the compensated luminous intensity.