Daily Light Integral Calculator
µmol/m²/s
hours
PPFD
PPFD
14.4mol/m²/dayband 9–36General
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How much photosynthetically active light a crop receives over a day, expressed as a single number.
What DLI describes
PPFD measures light intensity at a single moment. DLI accumulates that intensity across the hours the crop is lit, giving the total photosynthetically active light delivered in a day. The same instantaneous intensity can produce very different daily totals depending on how long it is sustained.
Where it is used
- Comparing light between seasons, sites or compartments
- Deciding whether supplementary lighting is needed, and for how long
- Checking light levels against a crop’s requirement
Contact
Planning a lighting strategy?
Light rarely sits on its own. It connects to climate, crop strategy and system design.