lux to PPFD Convertor – Online calculator

Converting LUX (Lumen/m²) to PPFD Photosynthetic Photon Flux Density.

The Conversion-factor is depending on the light spectrum.  Note: a higher value does not indicate a better or more efficient light source.

LUX / light-meter are much less expensive than a quantum spectrometer to measure PPFD.
Also, every state of the art smartphone contains a lux-sensor. Please note that the results from smartphones vary tremendously. That’s why it is required to calibrate your sensor.