Greenhouse Lighting Calculator

Calculate supplemental lighting requirements for greenhouse growing. See month-by-month natural vs supplemental DLI and total fixture wattage needed to hit your crop targets year-round.

Greenhouse details
Location and crop
Max photoperiod for supplemental light

Please enter greenhouse dimensions.

Total fixture wattage needed
0 W
0
Months needing supplement
0
W per sq ft
$0
Annual electric cost
Natural vs supplemental DLI by month
Natural DLI (through glazing)
Supplemental DLI needed
Month-by-month breakdown
Month Natural DLI Deficit Supp hrs Status
Greenhouse area
Total transmission factor
Required PPFD (supplemental)
Total fixture wattage
Annual kWh (supplemental)
Annual electricity cost
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The calculators and tools on LightingCalc.lighting are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. LightingCalc.lighting makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.