Light sensor values differes from device to device - are the readings reliable? I have launched an onboard sensors reading application on 2 phones: HTC M8 (Android 6) and Motorola Moto G (Android 5).

Those phones lays on my desk one just next to the other. And light sensor's readings are completely different: HTC shows 150 luxes and Moto shows 365 luxes.

This is a nonsense to use those sensors if readings are so different. Can those readings be treated as reliable? Can we do something about that issue?
Light sensor is sensitive to angle from light source too.
Make sure that your two phones have same angle from the light source.