Grow-stage DLI planner
Map DLI targets across your whole cycle. Each stage shows the required PPFD to hit its optimal DLI at that photoperiod — the number you set light height and dimmers to. Save and share your plan as a link.
Set a start date or grow day to highlight the active stage and its target DLI & required PPFD.
Seedling and vegetative targets follow the propagation and vegetative-stage light studies (cuttings root best near 10 mol/m²/day; vegetative growth levels off around 30–40). Flowering targets sit on the linear yield-versus-PPFD relationship measured at 12 h, with the ripening stage eased back as leaf photosynthesis declines late in the cycle. The 18 h / 12 h photoperiods are the conventional short-day trigger; Ahrens et al. show 13–14 h also initiates flowering in many cultivars. [11, 24, 22, 23, 25]