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Red, Blue and Green given out the white light for human species.

Human is "Trichromacy". It means we have 3 type of receptors response to red, blue and green light. Only 3 colours responses at different degree translated by out brain to see whole spectrum of light as it is.

For a true white light, it is the black body radiation of temperature 5000 - 6000 K and complete range of spectrum according to that temperature.

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