Supplemental Lighting Calculator
Calculate grow light fixture count and energy cost to reach target DLI and PPFD for greenhouse crops.
Inputs
sq ft
µmol/m²/s
mol/m²/d
hrs
W
µmol/m²/s
$/kWh
Results
Fixtures Needed
63
Monthly Electric Cost
$1,161.22
Target DLI23 mol/m²/d
Supplement DLI Needed13 mol/m²/d
Required Supplemental PPFD226 µmol/m²/s
Total Wattage20,160 W
Daily Energy322.56 kWh
How to Use This Calculator
- Enter your total growing area in sq ft and the target PPFD (µmol/m²/s) for your crop — leafy greens ~200, tomatoes ~400–600.
- Enter the natural DLI (mol/m²/d) available from sunlight in your location and season, and your desired total photoperiod in hours.
- Select fixture type (LED, HPS, or CMH) and enter each fixture's wattage and PPFD output at canopy level.
- Enter your electricity cost per kWh to calculate Monthly Electric Cost.
- Review Fixtures Needed, Total Wattage, and Daily Energy (kWh) to plan your electrical service requirements.
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