PPFD to Lux Calculator
This calculator helps you estimate lux (a measure of visible light brightness for human eyes) from a given PPFD (Photosynthetic Photon Flux Density, in µmol/m²/s). While PPFD tells you how much light is usable by plants for photosynthesis, lux is a human-centric brightness metric. Because different types of light sources have different spectral qualities, this tool uses conversion factors based on the light type you select to give an approximate lux value.
Enter your PPFD value (µmol/m²/s):
Select your light source type:
What is Lux?
Lux measures visible light as perceived by the human eye. It helps assess how bright a space appears but does not accurately reflect how much light plants can use for photosynthesis.
How the Conversion Works
Since PPFD measures light usable by plants and lux is based on human visual response, we apply approximate conversion factors that depend on the light spectrum of your source.