If a vendor includes the light  he should also include the render settings. Stuff can look very different if you use GC, or even worse, GI, Especially if the materials aren't build for GC or GI.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.