White light and sunlight,

The sun does not radiate monochromatic light,

but is a mixture of all the colors in the visible spectrum.

Sunlight is close, but not identical to a white light spectrum.

Sunlight has more EM waves in the medium length (yellowish) frequency.

This is only visible light waves, and

only about half the energy of sunlight at the earth's surface is visible, about 3 percent is ultraviolet, and the rest is infrared.

One way stars are classified is by their spectral signature;

our sun is a yellow star.

Most accurately, it emits most yellow-green frequencies.

Therefore, everything ‘under the sun’ is coloured by its quality of light.

(The complementary or opposite of yellow-green is a warm blue or purple)

Diurnal cycle and blue and red shift!

During the middle of the day,

there is a blue bias to sunlight.

… the color of the sky.

Ultraviolet radiation is also strongest then

(and causes the energetic effects of sunburn, fading paints, fabrics, etc.).

At sunrise or sunset,

the sun's light passes more obliquely through the atmosphere,

and filters out the shorter ("blue" and "green") wavelengths

and the light has a red bias.

Prisms

Splitting the Spectrum

Once full spectrum, or white light

is split in a prism,

there is no further subdivisioning into ‘sub spectrums’.

E.g., red or long wave radiations

do not further subdivide into anything other than red;

e.g., the 700 nm wavelengths are 700 (red).

Period.

This esoteric concept that

a subray of a primary ray,

e.g., the green subray of indigo,

cannot occur in exoteric science.

There are no ‘subrays’ of indigo

… exoterically.

The longest wavelength most humans see

is deep red at about 700 nm.

The shortest wavelengths normally detectable

is violet, at about 400 nm.

Human eyes respond the most to

a yellow-green light, at 550 nm,

which is the brightest color in sunlight