type PDL_SensorType PDL_SENSOR_ALS (2) lux Sint32 Ambient light level in SI lux units, a measure of a surface's luminosity. One lux is equal to one lumen per square metre. Office lighting typically measures between 320-500 lux. PDL_AngularVelocityEvent Struct returned for a PDL_SENSOR_ANGULAR_VELOCITY event. The angular velocity sensor returns a vector quantity