The formula to calculate the PPFD (\(\mu mol m^{-2} s^{-1}\)) from Lux is:
\[ PPFD = Lux \times Conversion\ Factor \]
Where:
The formula to calculate the temperature increase (\(\Delta T\)) from PPFD is:
\[ \Delta T = \frac{PPFD}{13} \times 0.5 \]
PPFD (Photosynthetic Photon Flux Density) is a measure of the number of photons in the photosynthetically active radiation (PAR) range that are incident on a surface every second.
Lux is a measure of illuminance, the total amount of visible light illuminating a point on a surface.
Let's assume the following values:
Using the formula:
\[ PPFD = 1000 \times 0.0185 \]
Evaluating:
\[ PPFD = 18.5 \]
The PPFD is 18.5 µmol m⁻² s⁻¹.
Using the temperature increase formula:
\[ \Delta T = \frac{18.5}{13} \times 0.5 \]
Evaluating:
\[ \Delta T = 0.71 \]
The temperature increase is 0.71 °C.
| Light Type | Conversion Factor |
|---|---|
| Sunlight | 0.0185 |
| Fluorescent | 0.0165 |
| Mogul HPS | 0.0122 |
| Agro HPS | 0.0130 |
| MH | 0.0141 |
| Philips 315 ARgo 3100K CMH | 0.0170 |
| Philips 315 4200K CMH | 0.0154 |