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Seasons and Greenhouses

Daily Light Integral Calculator

Daily Light Integral is intended to estimate DLI from average PPFD and daily light duration factor. Replace its starting values with the scenario being evaluated.

Enter values for daily light integral

Daily Light Integral needs average ppfd and light duration factor from one case.

µmol/m²/s

Use the value that represents average ppfd.

mol/day per µmol/s

Enter light duration factor as a percentage from 0 to 100.

Scope of this daily light integral calculation

Daily Light Integral focuses on Daily light integral and combines Average PPFD and Light duration factor. Where required heater input matters, consult Greenhouse Heater Capacity Calculator.

Use daily light integral to estimate DLI from average PPFD and daily light duration factor, then inspect average ppfd in the field.

Testing a change in average ppfd

To compare alternatives, save the current result before changing Average PPFD. Label both cases so the source measurements remain clear.

Average PPFD and the other inputs

For daily light integral, collect Average PPFD and Light duration factor on the Daily Light Integral basis.

  • Average PPFD. The Daily Light Integral assumption is 250 µmol/m²/s; note the source of any replacement.
  • Light duration factor. Its Daily Light Integral demonstration rate is 0.043 mol/day per µmol/s.

Collecting data for Daily Light Integral

Recalculate after changing a covering, setpoint, ventilation rate, crop load, or equipment capacity.

From average ppfd to daily light integral

daily light integral = average ppfd × light duration factor

Daily Light Integral multiplies factors from Average PPFD and Light duration factor to produce daily light integral.

Average ppfd at 250 µmol/m²/s, light duration factor at 0.043 mol/day per µmol/s produces 10.80 mol/m²/day in the demonstration case.

In the Daily Light Integral example, changing Average PPFD from 250 µmol/m²/s to 275 µmol/m²/s produces 11.88 mol/m²/day rather than 10.80 mol/m²/day.

Use average ppfd only to compare daily light integral.

Pair average ppfd with Daily Light Integral site observations.

Using the Daily Light Integral result

The result panel emphasizes daily light integral. Check the input units before judging one scenario against another.

Daily Light Integral field limitation

A single average may hide large changes during the day.

After calculating daily light integral

Archive the Daily Light Integral inputs—Average PPFD and Light duration factor—beside Daily light integral.

A short source note for average ppfd is enough to distinguish evidence from an assumption.

When the garden work is finished, append the actual daily light integral rather than revising the prediction.

Daily light integral questions

Can Daily Light Integral guarantee field or greenhouse conditions?

No. The daily light integral value reflects the entered dates or readings. Confirm it with a current forecast or sensors positioned near the crop.