Daily Light Integral (DLI)

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Measure the total accumulation of photosynthetically active radiation (PAR) received by plants over a 24-hour period.

Light Parameters

PPFD (μmol/m²/s)

Photoperiod (Hours)12h

Light Accumulation

21.60mol

Daily Light Integral

Daily Dosage21.6mol/m²/d

Total Photons21.6M μmol

About this calculator

Overview

The Daily Light Integral (DLI) represents the total amount of light photons (PAR) that land on a target area per day. Think of it as the 'daily dose' of light for your plants.

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Pro Tips

Low Light (Ferns/Microgreens): 5-10 mol/m²/d
Medium Light (Houseplants/Ornamentals): 10-20 mol/m²/d
High Light (Tomatoes/Fruiting Crops): 25-45+ mol/m²/d
Increasing photoperiod is often more energy-efficient than increasing PPFD.

Fun Facts

"Light intensity (PPFD) and duration (Photoperiod) are equally important for DLI."
"Professional greenhouse growers use DLI to decide when to use supplemental lighting."
"Cannabis flowering typically requires a DLI of 30-45 mol/m²/d for optimal yields."

Formula: DLI = PPFD × Hours × 3600 / 1,000,000