Bands × HORO — spectrum

Band	Step	Description	nm (wavelength)
RED · red	base	longest wavelength — lowest energy	700
ORANGE · orange	share	second step up	620
YELLOW · yellow	weave	third position — between warm and cool	580
GREEN · green	crest	crest — peak of human visual sensitivity	530
BLUE · blue	descent	transition to short wavelengths	470
INDIGO · indigo	round	deep blue — approaching the UV edge	445
VIOLET · violet	unity	shortest wavelength — ring closes (next octave is UV)	410

Sources (1)

• CIE — International Commission on Illumination(2024-01-01)