A color, or shade of color; tint; dye.
A character; aspect.
The characteristic related to the light frequency that appears in the color, for instance red, yellow, green, cyan, blue or magenta.
the state of being luminous, or a luminous object; brilliance or radiance
the rate at which a star radiates energy in all directions
the ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor