PPFD to Daily Light Integral (DLI) Calculator

Formula

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

\[ \text{DLI} = \frac{\text{PPFD} \times 3600 \times \text{Light Hours}}{10^6} \]

Where:

\( \text{DLI} \) is the Daily Light Integral in mol/m²/day.
\( \text{PPFD} \) is the Photosynthetic Photon Flux Density in µmol/m²/s.
\( \text{Light Hours} \) is the number of hours of light per day.

Definition

Daily Light Integral (DLI) is a measure of the total amount of photosynthetically active radiation (PAR) received by a plant in a day. It is expressed in moles of light per square meter per day (mol/m²/day).

How to calculate DLI

Let's assume the following values:

PPFD = 500 µmol/m²/s
Light Hours = 12 hours

Using the formula:

\[ \text{DLI} = \frac{500 \times 3600 \times 12}{10^6} \]

Evaluating:

\[ \text{DLI} = 21.6 \text{ mol/m²/day} \]

The DLI is 21.6 mol/m²/day.