Light Calculator
Convert Lux to PPFD and DLI for optimal lighting.
Calculate PPFD & DLI
Enter your light measurement in Lux
How long are lights on each day?
Area covered by lights (m²)
Different LED types have different efficiency factors
Results
PPFD
0
µmol/m²/s
DLI
0
mol/m²/d
Optimal DLI Ranges
LightDLISeedlings
2–8 mol/m²/d
Ideal: 4
LightDLIVegetative
8–15 mol/m²/d
Ideal: 12
LightDLIFlowering
12–30 mol/m²/d
Ideal: 20
What is PPFD & DLI?
PPFD measures photons hitting your plants per square meter per second.
DLI is total daily light (PPFD × hours). Think of it as your plant's daily light food.
Lux ÷ Factor = PPFD
PPFD × 3600 × h ÷ 1 000 000 = DLI
LED Conversion Factors
Full Spectrum55
Quantum Boards65
Red/Blue LEDs50
High-End LEDs70
COB LEDs60
Lux ÷ Factor = PPFD