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The first light bulbs were incandescent, with a continuous emission spectrum of all the visible colors.
Fluorescent bulbs provided a more discrete spectrum, with peaks of red, green, and blue.
Our eyes interpret combinations of red, green, and blue light as colors like yellow, magenta, cyan, and white.
LED chips changed everything.
LEDs offer a variety of emission spectra to choose from.
Multiple LED chips can be combined in a single light fixture.
The intensity of each chip can then be adjusted to get precisely the color you want.
The spectrum can automatically adjust to match the Sun's spectrum throughout the day.
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