Understanding DLI: How Much Light Do Plants Need?
Home > Hydroponics > Understanding DLI: How Much Light Do Plants Need? Last Reviewed: August 2026 | Author: Faisal Habib, CEA Lighting Specialist | Fact-Checked: Lab and Field Verified | Expert Reviewer: Dr. Serena Mitchell, Photobiology Research Director Difficulty: Beginner to Intermediate | Calculation Time: 15 Minutes | Target Range: 12–35 mol/m²/day ⚡ Quick Answer: Daily Light Integral (DLI) Daily Light Integral (DLI) is the total quantity of photosynthetically active photons delivered to a crop canopy over 24 hours. Leafy greens require 14 to 17 mol/m²/day, while fruiting crops need 25 to 35 mol/m²/day. Calculate your exact value using the formula: PPFD × photoperiod (hours) × 0.0036. 📖 Definition: Daily…