Cannabis DLI PPFD Calculator

DLI Calculation Formula:

\[ DLI = \frac{PPFD \times 3600 \times Hours}{1,000,000} \]

DLI (mol/m²/day):

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1. What is a Cannabis DLI PPFD Calculator?

Definition: This calculator estimates the Daily Light Integral (DLI) for cannabis plants based on Photosynthetic Photon Flux Density (PPFD) and light duration.

Purpose: It helps cannabis growers optimize lighting conditions to maximize plant growth and yield.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ DLI = \frac{PPFD \times 3600 \times Hours}{1,000,000} \]

Where:

\( DLI \) — Daily Light Integral (mol/m²/day)
\( PPFD \) — Photosynthetic Photon Flux Density (μmol/m²/s)
\( Hours \) — Daily light duration (hours)

Explanation: PPFD is converted to DLI by accounting for the number of seconds in an hour (3600) and converting micromoles to moles (1,000,000).

3. Importance of DLI for Cannabis

Details: Cannabis plants require specific DLI ranges at different growth stages (20-30 for seedlings, 30-40 for veg, 40-50 for flowering) for optimal growth.

4. Using the Calculator

Tips: Enter your PPFD measurement (from a PAR meter) and daily light duration. Default light hours is 18 (common for vegetative stage).

5. Frequently Asked Questions (FAQ)

Q1: What's a good PPFD range for cannabis?
A: 200-400 μmol/m²/s for seedlings, 400-600 for veg, 600-900 for flowering.

Q2: How many hours of light should I use?
A: Typically 18 hours for vegetative growth, 12 hours for flowering.

Q3: What DLI is too high for cannabis?
A: Above 50-60 mol/m²/day may cause light stress without CO2 supplementation.

Q4: How do I measure PPFD?
A: Use a quantum PAR meter or check your grow light's specifications.

Q5: Does this account for light distance?
A: No, PPFD already accounts for intensity at the plant canopy level.