The formula to calculate the PPFD (\(\mu mol m^{-2} s^{-1}\)) from Foot-candles (FC) is:

\[ PPFD = FC \times Conversion\ Factor \]

Where:

• \(PPFD\) is the Photosynthetic Photon Flux Density.
• \(FC\) is the illuminance in foot-candles.
• Conversion Factor depends on the type of light source.