Day and night?

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Regular K

I am wondering, how would I be able to dark or lighten everything, with various values so just pre-rendering a dark/light version would work.

I thought of gamma, that seems to work but then my friend brought up the HUD (heads up display) and well, that would be affected also.

Possible I could counter a gamma effect, thus making an image/color look as if it wasnt effected?

Any ideas on day/night effects appreciated :)