DIALux evo 11.1: Different light distribution in simulation by using the same luminaire and -configuration

Hi

I'm using for a light simulation an imported LED flood light .ldt file. The light is not available on DIALux. I would like to calculate on a horizontal calculation surface the mean and min/mean values. Eventhough i use the same light (and light configuration such as light point elevation, tilt, etc.) just with different position on the horizontal surface, i get a huge difference regarding the horizontal illuminance (see attached, orange and black recangle). Replacement of the light and also copying the more powerful light didn't solved the issue.

The browsing of the commnuity collection couldn't give me an answer to this issue.

Any hint or problem solving appoach?

Thank you very much in advance.

Regards

Screenshot 2023-05-09 164429.png
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