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The formula to calculate PPFD (µmol/sm²) from Radiation (W/m²) is:
\[ \text{PPFD} (\mu mol/sm^2) = \text{Radiation} (W/m^2) \times 2.15 \]
Where:
Daylight solarimeter measures the solar radiation in W/m². PPFD (µmol/sm²) is a measure of the number of photosynthetically active photons that fall on a given surface area per second. The conversion from daylight solarimeter readings to PPFD helps in understanding the light available for photosynthesis.
Let's assume the following values:
Using the formula:
\[ \text{PPFD Outside} = 200 \times 2.15 = 430 \mu mol/sm^2 \]
\[ \text{PPFD Inside} = 430 \times 0.8 = 344 \mu mol/sm^2 \]
The PPFD inside is 344 µmol/sm².
| Radiation (W/m²) | PPFD (µmol/s·m²) |
|---|---|
| 5 | 10.750 |
| 10 | 21.500 |
| 15 | 32.250 |
| 20 | 43.000 |
| 25 | 53.750 |
| 30 | 64.500 |
| 35 | 75.250 |
| 40 | 86.000 |
| 45 | 96.750 |
| 50 | 107.500 |
| 55 | 118.250 |
| 60 | 129.000 |
| 65 | 139.750 |
| 70 | 150.500 |
| 75 | 161.250 |
| 80 | 172.000 |
| 85 | 182.750 |
| 90 | 193.500 |
| 95 | 204.250 |
| 100 | 215.000 |
| 105 | 225.750 |
| 110 | 236.500 |
| 115 | 247.250 |
| 120 | 258.000 |
| 125 | 268.750 |
| 130 | 279.500 |
| 135 | 290.250 |
| 140 | 301.000 |
| 145 | 311.750 |
| 150 | 322.500 |
| 155 | 333.250 |
| 160 | 344.000 |
| 165 | 354.750 |
| 170 | 365.500 |
| 175 | 376.250 |
| 180 | 387.000 |
| 185 | 397.750 |
| 190 | 408.500 |
| 195 | 419.250 |
| 200 | 430.000 |