Wavelength to RGB and HEX Calculator
   --- 449797 wavelengths served to date ----
Wavelength (nm):

Wavelength: 640nm

Red: 255   Green: 19   Blue: 0

RGB Hex: #FF1300

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The ASP used behind the scenes is based on an
algorithm from Dan Bruton's Color Science Page:
http://www.physics.sfasu.edu/astro/color.html