Daily light integral (DLI) describes the number of photosynthetically active photons (individual particles of light in the 400-700 nm range, PAR) that are delivered to a specific area over a 24-hour period. This variable is particularly useful to describe the light environment of plants.
Source: Wikipedia - DLI
DLI for the standard illumination periods 12h, short day and 18h, long day. The sample below shows a constant DLI of 26 mol/d for a short day plant (*sdp) . This is achieved by an intensity of 400 μmol/m²s for 18 hours in vegetative phase and 600 μmol/m²s for 12 hours during the blooming/flowering phase.
*sdp - short day plant - flowering phase is initiated in short day phase
The pictures shows the variying DLI through a one year period in a greenhouse. Artificial LED lighting can be used to increase the DLI during times with too less natural sunlight and extend a facilities productive period.
Provide ppfd value at your canopy level as well as the illumination period.
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