Method 1: Polar coordinate representation
Definition: This method is commonly used to describe the light distribution of lamps in indoors and roads. It visually represents the light center of the luminaire with the origin of the polar coordinates, the vector of the direction of the light intensity, and the angle between the light intensity vector and the optical axis at the angle of the polar coordinate;
Features: The advantage of polar representation is image and intuitive
Method 2: Cartesian Coordinates
　　 Definition: This method is commonly used to describe the distribution of luminaires and source light with very narrow luminaires and light distribution. The center of the light is represented by the origin of the Cartesian coordinates, the direction angle is represented by the abscissa, and the light intensity is represented by the ordinate.
Specific: The advantage of Cartesian representation is that it is easy to check the light intensity values ​​at different angles.
Edit: Sophy
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