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The standard reference illuminant used as the scene light source when calculating the CameraCharacteristics.SensorColorTransform1, CameraCharacteristics.SensorCalibrationTransform1, and CameraCharacteristics.SensorForwardMatrix1 matrices.
The values in this key correspond to the values defined for the EXIF LightSource tag. These illuminants are standard light sources that are often used calibrating camera devices.
If this key is present, then CameraCharacteristics.SensorColorTransform1, CameraCharacteristics.SensorCalibrationTransform1, and CameraCharacteristics.SensorForwardMatrix1 will also be present.
Some devices may choose to provide a second set of calibration information for improved quality, including CameraCharacteristics.SensorReferenceIlluminant2 and its corresponding matrices.
Possible values:
Optional - This value may be null on some devices.