Specular reflection brightness calculation

I am doing a study on glare from PV panels and I was wondering if there is a way to calculate the reflected “indirect” glare, where the sensor in the grasshopper only receives the light reflected from the PV panels and not the direct sunlight. Is there a recipe for such a cell?
Would love to know your thoughts and suggestions on this. Thanks!

@chris Hello! I’m sorry to bother you, can you please help me with this? This problem has been bothering me for a long time and I have searched a lot of literature but I can’t find a solution.

There are many similarities between our studies, so I would like to ask which physical quantity you use to express glare intensity when you do outdoor glare simulation? And which evaluation system is used for evaluation? Look forward to communicating with you.