Lux and PPFD Conversion Calculator







Formulas

To calculate PPFD from Lux:

\[ PPFD = \text{Lux} \times \text{Conversion Factor} \]

To calculate Lux from PPFD:

\[ Lux = \text{PPFD} \times \text{Conversion Factor} \]

What is Lux to PPFD Conversion?

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.

What is PPFD to Lux Conversion?

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.

Conversion Factors

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 Calculations

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.