RAK12019 UV sensor

Hello, I am a bit confused by the output of my RAK12019 UV sensor.
So I used the sample code on the RAK website and my results (when the sensor is set to UV mode) is
Im not sure what UVI and UVs are.
My best guess is that UVI is the UV index however, I cannot find anything on UVs
When the sensor is set to ALS mode the data we get is:
What does Als Data mean? I think Lux Data is the Lux (light energy per sqm).

Could someone please tell me?