Wiktionary
n. 1 (context physics English) The portion of the electromagnetic spectrum that is visible to humans. 2 (context physics English) an extension of the human-visible spectrum to include near-visible wavelengths, primarily near infrared.
Usage examples of "light spectrum".
He rushed through the archway and down the houses main central corridor, which was dimly lit in the soft hues of faerie fire, allowing for sight in the normal light spectrum but not bright enough to defeat the use of infra vision.
The inside of the mound was lighted, forcing Jarlaxle to pause and allow his eyes to shift back to the visible light spectrum.
It had had to be designed to block the sunstorm's peak-energy bombardment in the visible light spectrum, but could do nothing about an anticipated accompaniment of X-rays, gamma rays, and other nasties, peripheral in terms of the storm's total output, but potentially devastating for the Earth.
The double sun can give out the normal light spectrum but on reflection from these moons, the light shifts upward in the spectrum.
The room was alight in a comfortable red glow, allowing Dinin to shift his eyes from the infrared to the normal light spectrum.
Faint purple light surrounded the young Matron Mother, casting eerie shadows throughout the chamber and forcing the eyes of the priestess seated before her into the light spectrum.
Surely you can match a star to the light spectrum in the ship’.
In this case the flare appeared as an extremely bright spot ten thousand miles in diameter, affecting not only alpha hydrogen and ionized calcium spectral lines but also the white light spectrum from the sun.