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Photosynthetic Saturation

Photosynthesis rates are proportional to light intensity to a certain point. The saturation point has been met when photosynthesis is at a maximum. Increasing light levels beyond the plants photosynthetic saturation point will not increase the rate of photosynthesis


Photosynthetic Photon Flux (PPF)
Photosynthetic Photon Flux (PPF) is a unit of measure to express the light quantum in photons of solar energy (specific to wavelength) related specifically to photosynthesis and is measured with a quantum meter in units called micromoles

The Photosynthetic Photon Flux (PPF) calculation is:
mol m-2 s-1 (micromoles of photons per meter squared, per second)

The table below provides a reference to light levels for (certain) plants or solar conditions

Approximate PPF for:
Healthy Plant Growth
(micromoles)
House Plants 30 to 200 PPF
Leafy Crop Plants (i.e. Lettuce & Basil) 200 to 600 PPF
Tomatoes & Other Fruit Crops 400 to 1000 PPF
Approximate PPF for:
Solar Condition
(micromoles)
Full Sunlight in Summer @ Noon 2000 PPF
Full Sunlight in Winter @ Noon 1200 PPF
Approximate PPF for:
(Chameleon™ Solar Genesis™ Grow Lights)
(micromoles)
Solar Genesis II 2000 x 2 (full spectrum)
Solar Genesis VI 2000 x 2 (full spectrum)
400 umoles PAR LED's (augmenting full spectrum)

Measurement Taken @ 8" from Light (recommended distance from plant canopy for optimum performance)

Approximate PPF for:
(Standard HID Grow Lights)
(micromoles)
High Pressure Sodium (1000w) 2000
Metal Halide (600w) 750 (limited spectrum)

Measurement Taken @ 12" from Light (recommended distance from plant canopy for optimum performance)

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