David Mullen ASC
Moderator
are you changing the angle of the light/sun or just the color temp? (being that they are pre-lit)
are you creating silhouettes and shadows to add to his time of day effect?
Just because the set is pre-lit doesn't mean you don't make adjustments (unless it is a very low-budget show with no time) -- in our case, the "sun" (20K's on a sliding truss) can be lowered up or down on chain motors, though I can't raise them high enough to get a near-noon angle because of the limitations of the stage height. But I can lower them all the way down to the floor of the stage (which we do to change gels on them). Most of the time, I just leave the camera at 3200K and do the adjustment to the color of the sunlight with gels or dimming (though a 50% dim is just like a 1/4 Orange gel effect.)
As for silhouettes and shadows, that's an exposure and mood issue that depends on the scene.