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Turn your light's intensity and hours into a Daily Light Integral (DLI), see whether it matches what your crop needs, and find out how many hours — or how much intensity — would get you there.
1. What are you growing?
2. Your light
PPFD is measured at the plants, not printed on the box — it drops as the light is raised. Many grow-light makers publish PPFD charts by hanging height; a PAR meter or phone-based PAR app gives a rough real reading.
12 – 17
Target DLI (mol/m²/day)
12 – 16 h
Typical photoperiod
Enter your light intensity (PPFD) and hours per day to see your DLI.
DLI = PPFD × hours × 3600 ÷ 1,000,000. Target ranges are typical starting points from controlled-environment growing — references vary, and natural light from a window counts toward the total. Plants also need a dark period, so avoid 24-hour lighting.