Multi-spectral LED fixtures can provide excellent color rendering properties and a large color gamut. My favorite in this discipline is a wall wash from Robert Juliat that uses 8 different LEDs. Additional to red, green, blue we find royal blue, cyan, amber, warm white and cool white. To master such a multi-spectral system means to pick from all metameric color options the one that fits best the given purpose.
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The color of leaves depend strongly on pigments present. Knowing how much chlorophyll and carotenoid is contained helps to estimate the leaf color. In autumn when it starts to get cold, foliage trees stop making chlorophyll. Instead, those plants break down chlorophyll into smaller molecules. As chlorophyll goes away, other pigments start to show their colors. Anthocyanins are plant pigments that are mainly made in fall, not all trees can make anthocyanin.
The three spectral power distribution curves shown below characterize typical colors of green, yellow and red American sweetgum (Liquidambar styraciflua) leaves.
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A unique hue is defined as a color which an observer perceives as a pure, without any admixture of another color. If we take red as example than there are pure red hues and hues that contain either yellow or blue. In the following the spectral reflectance curves of 6 red samples of the CES color set used in the IES TM-30-15 procedure are compared.

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