> Okay, I just re-rendered the scene specifying #version 3.6 instead of
> #version 3.7. There is a huge difference! I cannot explain it however. I
> don't know why there is such a big difference.

What might me worth doing is to add 4 "control" blocks, where you set 
the xyY values to that of the sRGB primaries and the white point:

https://en.wikipedia.org/wiki/SRGB

In theory those should end up as pure red,green,blue and white on your 
final image, and would highlight any lighting issues with the scene.

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