Light Use Efficiency

Light Use Efficiency (LUE) refers to a plant's ability to convert photosynthetically active radiation (PAR) into biomass. In cannabis breeding, this trait is measured by the ratio of dry matter accumulated per unit of light energy absorbed. Breeders working in controlled-environment agriculture (CEA) and indoor cultivation often prioritize genotypes that demonstrate higher LUE to reduce energy inputs while maintaining yield. This classification is particularly relevant for greenhouse and vertical farming operations where lighting costs directly impact profitability. Some lineages are documented to exhibit more efficient photosynthetic pathways than others, though LUE varies significantly with environmental conditions, nutrient availability, and cultivation technique.

Selection for light efficiency helps breeders develop cultivars suited to low-light environments and energy-constrained production systems. Higher LUE genetics can reduce the need for supplemental lighting, making them valuable for sustainability-focused breeding programs.