I'm trying to get quiet same result as a render from a great and famous french factory...but I can't

I can't get the same blue color on ground and yellow light on ceiling.
Why? I don't know...I'm using a 100m sphere with texture 200% lum and powered with KrayPhotonMultiplier, exponential 1.4, 1, desaturate shader 50% on floor
can anybody help me get as closed as possible the same result as this great render...?
than