Welcome! Whiltelisted, moved this topic into the FirePro forum.
Can you provide your system configuration, namely:
3) Driver version
4) 3dsMax version
5) The scene demonstrating the issue
im going to talk about my experience maybe it help you.
when you change from a render to a physical render (havent tested this on 3ds ) your materials have to account for energy .
for example on "blender render"switching to "luxrender" you have to change the amount of light reflected by the material
on blender is on the color picker
so from my exp i can say your scene is like that because you have very bright material of course i could be wrong