How to Use the Daily Light Integral (DLI) Calculator
Calculate light energy accumulation for greenhouse plants:
Measure PPFD
Measure PAR light intensity at canopy height in μmol/m²/s.
Enter Hours
Input daily photoperiod operating hours (e.g. 18h veg, 12h flower).
Calculate DLI
Engine computes DLI = PPFD × Hours × 0.0036.
Match Crop Targets
Ensure DLI matches target species requirement for maximum yield.
Key Features & Photobiology
PAR Spectrum Integration
Measures total moles of photosynthetically active photons (400-700 nm) delivered per square meter daily.
Yield & Biomass Optimization
Direct correlation between DLI and crop dry weight accumulation.
100% Private Client Compute
Runs in browser memory with zero tracking or server logs.
Plant Physiology Guide: Daily Light Integral (DLI) in Agriculture
Daily Light Integral (DLI) measures the total number of light photons delivered to plants per square meter over a 24-hour period. Just as rainfall is measured in inches, DLI measures cumulative light energy driving photosynthesis.
Frequently Asked Questions
?What is a good DLI for indoor fruiting crops?
High-light fruiting crops (tomatoes, peppers, cannabis) thrive best with a DLI between 25 and 35 mol/m²/day.