Hi @Miguel1900 ,
I have been looking into this cant see why the
Photon Mapping is turned off in 4.26/4.27 BaseLightmass.ini
[DevOptions.PhotonMapping]
bUsePhotonMapping=False
bUseFinalGathering=True
in UE 5.3 and I believe all 5.X
[DevOptions.PhotonMapping]
bUsePhotonMapping=True
bUseFinalGathering=True
Last two days spent checking all the CUDA code is identical and thats true and correct