Photopic lux for view point

Hello,

I am trying to make a script in grasshopper to calculate the photopic lux for a particular view point in the room. I am considering only artificial lighting for this research.

Purpose of research- To calculate various photopic lux as I change the distance between the lighting fixtures and the view point.

I have made the script and connected all grids to the analysis part but I am facing problem of calculating my results. I have attached screenshot of some part of the script and also my '.gh' file along with the discussion.

Thanks for any help!