Light Reflectance

Light reflectance refers to the degree to which cannabis plant surfaces—leaves, trichomes, and stems—reflect ambient or grow-light wavelengths rather than absorbing them. This trait is influenced by leaf cuticle thickness, trichome density, epicuticular wax composition, and pigment concentration. Breeders and cultivators monitor reflectance because it affects photosynthetic efficiency, heat management under intense lighting, and visual appearance at harvest. Plants with higher reflectance on leaf surfaces often show silvery or frosted aesthetics, while lower reflectance typically correlates with deeper green or purple coloration. Understanding reflectance helps optimize canopy light penetration and inform phenotype selection in breeding programs.

Breeders working in controlled-environment cultivation often select for moderate reflectance to balance light absorption with thermal regulation. Reflectance traits are commonly paired with trichome development goals, as epicuticular wax—which increases reflectance—also influences terpene volatility and resin coating appearance.