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Daily Light Integral (DLI) Calculator

Formula

The formula to calculate the Daily Light Integral (DLI) is:

$DLI = PPFD \cdot LFD \cdot \left( \frac{3600}{1000000} \right)$

Where:

$DLI$ is the Daily Light Integral (mol/m²/d).
$PPFD$ is the Photosynthetic Photon Flux Density (µmol/s·m²).
$LFD$ is the Light Hours Per Day.

What is Daily Light Integral?

Daily light integral (DLI) is a measure of the total number of photosynthetically active photons (those in the range of 400-700nm) that are delivered to an area over a given period. It is an important metric in horticulture and agriculture to assess the light available for plant growth.

Example Calculation

Consider an example where:

Photosynthetic Photon Flux Density (PPFD): 500 µmol/s·m²
Light Hours Per Day (LFD): 12 hours

Using the formula to calculate the Daily Light Integral:

$DLI = 500 \cdot 12 \cdot \left( \frac{3600}{1000000} \right) = 21.60 \text{ mol/m²/d}$

This means that the daily light integral for this example is 21.60 mol/m²/d.