The “Solar Radiation” of the WSView-App corresponds to illumination (Light Intensity) measured in lux. This unit (lux) is what I get from the gateway. The WSView-App does show this value with the unit W/m² by default, but you can switch the unit in the settings of the WSView-App to get the exact value used by this plugin.
The irradiation-uv (UV Irradiation) is not shown in the WSView-App, but it is used to calculate the uv-index (UV Index).