A single-nanometre light wavelength of hue in the human visible spectrum
Human vision typically covers a 360 nanometre (nm) range of light wavelengths (λ) in the electromagnetic spectrum from 380 to 740 nm
Each Spectrum Degree (°Λ) maps it’s corresponding hues wavelength to a 1° arc on a 360° circular compass & progresses clockwise from the end of ultraviolet 1°Λ (381 nm λ) to the beginning of infrared 359°Λ (739 nm λ)
Note: The overlap point 0°Λ & 360°Λ (380 nm λ & 740 nm λ) is where visible light begins & ends (black or zero hue)
The structural backbone of all colour.
This scale doesn't apply to colours that are combinations of multiple wavelengths such as Pinks, browns, or greys, Tints (hue + white) & Shades (hue + black)
0°Λ = 380nmλ Black
End of the invisible Ultraviolet spectrum
1°Λ = 381nmλ Deep Violet
Start of the human visible light spectrum
180°Λ = 560nmλ Yellow-Green
The most sensitive peak point of human vision (560nmλ) is cleanly & neatly defined as 180°Λ, the midpoint of visible hue as well as a circle
359°Λ = 739nmλ Deep Tempa
End of the human visible light spectrum
360°Λ = 740nmλ Black
Start of the invisible Infrared spectrum
λ (Lowercase Lambda) is the standard symbol for Wavelength, measured in nanometres (nm)
Λ (Uppercase Lambda) is the proposed symbol for Spectrum, measured in Degrees (º)
Please note: "Spectrum" here specifically refers to the typical human-visible part of the electromagnetic spectrum.λ = Wavelength
nm = Nanometres
Λ = Spectrum
º = Degrees
Most humans can only differentiate hue increments of 1 to 2ºΛ.
Therefore for most practical applications, smaller & more precise Spectrum Degree increments are unnecessary.
However if you wish to do so in your practice or have found a niche application for Spectrum Degrees, then..
ºΛ follows the same notation system as angles or time
Convert Spectrum Degrees (°Λ) to wavelength (λ)
Convert Wavelength (λ) to Spectrum Degrees (°Λ)