An update! unreal engine 4.26 solved all my problem with lightning & I got the result I wanted. The only problem now is there seems to be a bug in the RHI settings. when I have dx12 RHI enabled an error comes up after a few minutes of work that closes the unreal engine and a message comes up that says my GPU has crashed or been disconnected. My Gpu supports DXR & when I have the same settings in unreal editor 4.25.4 with the older GPU light mass it runs without any problems.