Lux to PPFD Calculator Convert Lux to PPFD
Want to turn a lux reading into an estimated PPFD value? Enter the light level measured around your plant’s leaves, choose the closest matching light source, and this calculator will estimate the PPFD for you. Keep in mind that the result is an estimate because different light spectrums can produce different lux-to-PPFD relationships.
Lux to PPFD Calculator
Estimate PPFD from a measured lux reading using a published light-source conversion factor.
Important:
Lux-to-PPFD conversion is an estimate because lux is weighted for
human vision while PPFD measures photosynthetic photon flux density.
The correct factor depends on the light spectrum.
Enter the lux value measured where the plant leaves receive light.
Choose the source that most closely matches the light being measured.
Estimated PPFD
—
µmol/m²/s
Enter a lux reading to calculate an estimate.
Example:
25,000 lux with the selected 5000K white LED reference factor
produces an estimated PPFD of about
365 µmol/m²/s.
This calculator does not measure PPFD directly. For a direct PPFD
measurement, use a suitable quantum/PAR meter. Conversion accuracy
depends on how closely the selected spectrum matches the actual light.
Conversion factors:
Published reference values from Apogee Instruments and a published
white-LED conversion table based on the specified Philips Luxeon Rebel
LED.