To calculate PPFD from Lux:
\[ PPFD = \text{Lux} \times \text{Conversion Factor} \]
To calculate Lux from PPFD:
\[ Lux = \text{PPFD} \times \text{Conversion Factor} \]
Lux to PPFD conversion allows you to convert illuminance measured in Lux to photosynthetic photon flux density (PPFD) measured in µmol m-2 s-1. This conversion is useful in horticulture and agriculture for understanding how much light is available for photosynthesis. The conversion factor varies depending on the type of light source.
PPFD to Lux conversion allows you to convert PPFD back to Lux. This is useful when needing to relate photosynthetic photon flux density to illuminance. The conversion factor also varies depending on the type of light source.
| Light Source | Lux to PPFD | PPFD to Lux |
|---|---|---|
| Sunlight | 0.0185 | 54.4 |
| Cool White Fluorescent | 0.0135 | 74.1 |
| Mogul Base High Pressure Sodium | 0.0122 | 82.0 |
| Dual-Ended High Pressure Sodium (DEHPS) | 0.0130 | 76.9 |
| Metal Halide | 0.0141 | 70.9 |
| Ceramic Metal Halide (CMH942) | 0.0154 | 64.9 |
| Ceramic Metal Halide (CMH930-Agro) | 0.0170 | 58.8 |
Example 1: Lux to PPFD
Step 1: Multiply the Lux by the conversion factor for sunlight:
\[ PPFD = 10000 \times 0.0185 = 185 \]
The PPFD is 185 µmol m-2 s-1.
Example 2: PPFD to Lux
Step 1: Multiply the PPFD by the conversion factor for sunlight:
\[ Lux = 200 \times 54.4 = 10880 \]
The Lux is 10880 lx.