 The visible light spectrum ranges from about 380 to 740 nanometers. Colors of the spectrum such as red, orange, yellow, green, cyan, blue, and violet are in this range. These spectral colors do not refer to a single wavelength, but rather to a set of wavelengths: red, 625–740 nm; orange, 590–625 nm; yellow, 565–590 nm; green, 500–565 nm; cyan, 485–500 nm; blue, 450–485 nm; violet, 380–450 nm.