Grow Light Calculator — FarmTracker Design Group

1

Growing Space ▼

Grow Area Length (ft)

Grow Area Width (ft)

Grow Area (sq ft)

Ceiling / Mounting Height (ft)

Hanging Height above Canopy (ft)

Distance the fixture hangs below the ceiling, or is positioned above the plant canopy. Typical: 1–3 ft for LED panels.

Number of Grow Zones

Total Grow Area (sq ft)

2

Crop Requirements ▼

Crop Type

Target DLI (mol/m²/day)

Photoperiod (hours/day)

Required PPFD (μmol/m²/s)

PPFD = (DLI × 1,000,000) ÷ (photoperiod × 3,600). This is the instantaneous light intensity needed at the canopy.

3

Fixture Selection ▼

Light Type

Fixture Efficacy (μmol/J)

Fixture Wattage (W)

Fixture Coverage Area (sq ft)

Fixture PPF (μmol/s)

Fixtures per Zone

Total Fixtures

Actual PPFD Achieved (μmol/m²/s)

Actual DLI Achieved (mol/m²/day)

DLI Status

✓ Target Met

Tip: For the best canopy uniformity, keep hanging height ≥ 50% of the fixture spacing. Overlapping coverage patterns from adjacent fixtures improves uniformity.

4

Energy & Cost ▼

Operating Days per Year

Electricity Rate ($/kWh)

Fixture Cost Each ($)

Total System Wattage (W)

Daily Energy Use (kWh)

Annual Energy Use (kWh)

Annual Electricity Cost ($)

Total Fixture Cost ($)

Total Capital Cost ($, incl. 20% install)

Cost per mol of Light ($/mol DLI·m²·yr)

5

Supplemental vs. Full Cycle ▼

If you have natural light available (greenhouse / partial daylight), you may not need to run lights the full photoperiod. Enter your winter natural light data to calculate savings.

Natural Light Hours/Day (winter)

Natural Light Intensity (% of target PPFD)

Natural DLI Contribution (mol/m²/day)

Supplemental DLI Needed (mol/m²/day)

Reduced Photoperiod Needed (hrs/day)

Annual Savings — Supplemental Mode ($)