"Spectral properties" refers to characteristics or traits related to the spectrum of something. In the context of light or electromagnetic waves, it specifically represents the different colors or wavelengths that compose the light. Full definition
Previous research linked trypophobic reactions to some of the same visual spectral properties shared by images of evolutionarily threatening animals, such as snakes and spiders. (sciencedaily.com)
Wakeford, H. R. & Sing, D. K. Transmission spectral properties of clouds for hot Jupiter exoplanets. (nature.com)
Fluorescent protein (FP) technology has become a ubiquitous research tool and with ever expanding applications, the need for new and improved FPs displaying unique features and specific spectral properties is growing. (journals.plos.org)