Daily Light Integral (DLI) Calculator

Your details

Forward mode converts a PPFD reading to DLI. Reverse modes let you plan a lighting setup by working backward from a crop DLI target.
Photosynthetic Photon Flux Density - measure with a PAR meter at canopy height. Typical values: 200-400 indoors, 500-2000 in direct sun.
umol/m2/s
How many hours per day the light is on.
h/day
Daily Light IntegralMedium light
17.28mol/m2/day

Total photons delivered per square metre per day

Light levelMedium (leafy greens, bedding plants)
17.28 mol/m2/day
Very low<5Low5-12Medium12-20High20-30Very high30+

DLI is 17.28 mol/m2/day - medium (leafy greens, bedding plants).

  • This DLI is within the target range for: Spinach, Cilantro, Basil, Begonia / Geranium.
  • At 300 umol/m2/s for 16 h/day your canopy accumulates 17.28 mol/m2/day.
  • DLI accumulates throughout the day, so even brief overcast periods matter. A PAR meter or quantum sensor gives the most accurate PPFD reading at canopy level.

Next stepCompare your DLI result to the crop reference table below to see whether your lighting meets the target for what you are growing.

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