Light Spectrum Dependent Expression

Light Spectrum Dependent Expression refers to phenotypic traits in cannabis that manifest differently depending on the wavelength composition of light during cultivation. Cannabinoid ratios, terpene profiles, pigmentation, and morphological features can shift under varying red, blue, far-red, and UV spectra. This phenomenon is documented in cultivation research and suggests that genetically identical plants may express different chemical or visual characteristics under distinct lighting conditions. Understanding spectrum dependency is relevant to both controlled indoor breeding and outdoor environmental factors. Breeders and cultivators working to stabilize strain genetics must account for how light quality influences trait expression across generations.

Breeders selecting for consistent phenotypes need to standardize lighting conditions during evaluation to distinguish genetic traits from environmentally induced variation. This classification helps explain why the same cultivar may show different aromatic or structural profiles when grown under different light sources.