illuminance.hpp

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namespace sensor_msgs::msg {
class Illuminance {
public:
    // Single photometric illuminance measurement.  Light should be assumed to be
    // measured along the sensor's x-axis (the area of detection is the y-z plane).
    // The illuminance should have a 0 or positive value and be received with
    // the sensor's +X axis pointing toward the light source.
    // 
    // Photometric illuminance is the measure of the human eye's sensitivity of the
    // intensity of light encountering or passing through a surface.
    // 
    // All other Photometric and Radiometric measurements should not use this message.
    // This message cannot represent:
    // - Luminous intensity (candela/light source output)
    // - Luminance (nits/light output per area)
    // - Irradiance (watt/area), etc.
 
    std_msgs::msg::Header header;  
    // frame_id is the location and direction of the reading
 
    double illuminance;  
 
    double variance;  
};
} // namespace sensor_msgs::msg