Most likely they are just bloom based light shafts. You have to check light shafts enabled on your directional light.
Regarding the issue at the stop of this thread, it’s probably just that the opacity needs to be adjusted to let more colored light through. You can try using the “lightmass replace” node and feed a lower opacity into lightmass. You should get nice colored light IF your directional light is static. Stationary lights only use shadow maps which cannot be colored. Dynamic lights would also have to be faked by using a projection.