Light Spectrum Cannabis

Light spectrum in cannabis cultivation refers to the wavelengths of electromagnetic radiation used during growth phases. Different wavelengths—particularly blue (400-500nm) and red (600-700nm)—influence plant morphology, flowering timing, and secondary metabolite production differently. Research indicates blue-spectrum light often correlates with more compact vegetative growth, while red spectrum is commonly associated with flowering phase development. Understanding light spectrum effects is central to controlled-environment breeding programs and phenotype stabilization. This is a cultivation variable rather than a chemical terpene, but spectrum choices significantly impact the expression of volatile compounds and plant structure across generations.

Breeders working in controlled environments manipulate light spectrum to stabilize desired traits—compact structure, flowering consistency, and terpene/cannabinoid ratios. Spectrum selection during seed development and mother-plant maintenance can influence trait expression in subsequent generations, making it a practical breeding tool alongside traditional genetics.