Light Cycle

Light cycle refers to the photoperiod—the ratio of light to darkness—that cannabis plants experience during their growth stages. In breeding and cultivation contexts, photoperiod directly influences flowering initiation and plant development patterns. Cannabis is a short-day plant, meaning flowering typically triggers when daily light exposure drops below a critical threshold (commonly 12-14 hours). Breeders manipulate light cycles in controlled environments to study growth morphology, measure flowering duration, and stabilize traits across generations. Understanding light cycle effects is foundational to breeding work, as photoperiod sensitivity varies significantly among cultivars and is a key factor in strain performance across different growing systems.

Breeders use controlled light cycles to manage flowering timing, evaluate photoperiod-dependent phenotypes, and distinguish between photoperiod-sensitive and photoperiod-insensitive (autoflowering) genetics. Standardized light protocols enable reproducible trait observation and accelerate selection for consistent growth characteristics.