Detect sun shine with some sensors and logic

What is the best was to detect sunshine?

I have two brightness and temperature sensors outside, multiple temperature sensor inside and a camera.

I want to get some redundancy with two brightness sensors, one of them is directly outside another one is in the shade. The area heats up, but this is very slow, so I guess this is not ideal. The other one is in the sun, but again, it probably takes some time for the temperature to change.

Of course I also can get forecast, cloud density and rain.

I read about the bayesian sensor, but I don’t really get it, yet. :slight_smile:

Does anyone have a similar setup?