WHAT IS A LIGHT SPECTRUM?
Light spectrum is the many different wavelengths of energy produced by a light source. Light is measured in nanometers (nm). Each nanometer represents a wavelength of light or band of light energy. Visible light is the part of the spectrum from 380nm to 780nm.
HOW TO EVALUATE THE QUALITY OF A LIGHT SOURCE
The spectral distribution chart is the best illustration of the quality of the light spectrum.