the basic colours for sun spectrum.....red,white,blue and yellow.
blend all this together and u will get natural sunlight.
use timers to play around on amount of hours each colour will be switch on.

yellow ...in the morning...9am onwards
yellow + white + red + blue...at midday 11am to 6pm
yellow +red...at dusk and for night viewing...6pm to 9pm

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Everyone Has a Photographic Memory..........some just dont have film!