Big difference in Lighting RT vs Production render

Hello,
who face already this problem of lighting difference between RT and Production render?
We can’t figure out what we are doing wrong.

Thanks

Which V-Ray version is this?

Best regards,
Vlado

2.45
The problem occur when a scene is scale up, including lights.
Scaling the object alone without the lights selected, solve the problem.

Oh. Thanks for the pointer; will fix it.

Best regards,
Vlado