swmcl & Pere: it's pretty clear that you don't understand why or how the specific bandpass filtration of RGB separation filters was intended to work in the way it does - & playing around at emulating tungsten lighting is irrelevant to the things that matter here. You need an appropriate set of RGB sources & to appropriately control them with enough precision for the purpose in hand. That's all there is to it. The difficult bit is making it work accurately & reliably enough to give the precise control necessary.
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