Daylight (lux) and Ray tracing are inaccurate

Hello, I would like to observe the changes in indoor illumination using a louvers.
When we did the simulation, the illumination intensity was continuously emphasized in only certain areas, so we used “Ray Tracing” and found that the illumination intensity and tracing did not match.
May I know why?

(I don’t know why, even if the time changes in the image at the bottom, only certain areas are highlighted.)

West+Blind (Legacy).gh (692.5 KB)