Thank you for clarifying the available APIs and the SensorKit limitation. I have submitted the enhancement request as FB25181710: "Public API for real-time ambient light chromaticity and illuminance on iPhone for display measurement." The request describes the sequential display-patch measurement use case, why the 24-hour holding period does not fit, and the limitations of the camera-based workaround. I would appreciate your help routing it to the appropriate team. Thank you.