Cannabis Light Plan Calculator

Fixture count and wattage from canopy area and target PPFD.

Canopy area (sq ft)

Target PPFD (µmol/m²/s)

Fixture type (0-3)

Photoperiod (hrs/day)

Hang height (inches)

Tab to move between fields

Fixtures needed

Total wattage4,200

Achieved PPFD1,009

Daily Light Integral (DLI)65.4

Heat output (BTU/hr)14,330

Amps (120V)35

Amps (240V)17.5

Monthly kWh2,268

Monthly electricity ($)$272.16

How to Use This Calculator

Enter total canopy area in sq ft and your target PPFD (µmol/m²/s) for the growth stage.
Select fixture type (HPS, CMH, LED mid-tier, LED top-tier) and photoperiod (hours/day).
Set hang height in inches above the canopy.
Review Fixtures Needed, Total Wattage, Achieved PPFD, DLI, and Monthly Electricity Cost.
Aim for a DLI of 40–65 mol/m²/day during flowering for maximum yield.

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