Horticulture Light Calculator

About these tools: These calculators help you understand the relationships between different light measurements and what your plants actually receive in the PAR zone. All conversions use industry-standard formulas for horticulture applications.

Conversion from daylight solarimeter to PPFD µmol/cm²

Radiation outside W/m²

Glass transmission %

PPFD outside

0.00 µmol/cm²

PPFD inside

0.00 µmol/cm²

Conversion factor: 1 W/m² ≈ 2.15 µmol/cm² for sunlight

Conversion from daylight sum solarimeter to DLI mol/m²

Radiation sum outside J/cm²

Glass transmission %

DLI outside

0.00 mol/m²

DLI inside

0.00 mol/m²

Conversion factor: 1 J/cm² ≈ 0.0215 mol/m² for sunlight

Conversion LUX to PPFD µmol/cm²

Radiation Lux

PPFD SUN

0.00

µmol/sm²

Factor: 0.0185

PPFD HPS SON-T

0.00

µmol/sm²

Factor: 0.016

PPFD Metal Halide

0.00

µmol/sm²

Factor: 0.019

DLI calculation from PPFD

Step 1: Outside Natural Light

Outside light sum J/cm²

Glass transmission %

Natural DLI outside

0.00 mol/dm²

Natural DLI inside

0.00 mol/dm²

Step 2: Artificial Light Fixture

PPFD of light fixture µmol/sm²

Radiation outside equivalent

0.00 W/m²

Hours of lighting	Natural DLI (mol/dm²)	Fixture DLI (mol/dm²)	Total DLI (mol/dm²)