Lux to PPFD Converter

Calibrate actual lux observations separately under matched lamp spectra and pool physical station exposure; not universal lux→PPFD conversion or existing measured-light uniformity audit.

Description

Lux describes human-vision illuminance, while PPFD describes photon flux per area.

Lux describes human-vision illuminance, while PPFD describes photon flux per area. Matched spectral calibration is needed to relate them.^[1]

Enter aligned nonempty nonnegative lux, positive source-specific factors and positive represented station areas. Return station estimates and area-weighted mean.

When to use Lux to PPFD Converter

Use Lux to PPFD Converter when you need to evaluate the supplied records under the calculation and evidence rules below. No universal lux conversion, spectrum identification or light-uniformity certification is provided.

Prepare the measured crop, container, lighting or inventory records requested. Supply verified local catalogs, calibration factors and crop-stage limits; keep units and dates consistent.

How to use Lux to PPFD Converter and understand its results

Prepare the measured crop, container, lighting or inventory records requested. Supply verified local catalogs, calibration factors and crop-stage limits; keep units and dates consistent.
Enter measuredLuxByStation, callerMatchedMicromolesPerLuxSecond, representedStationAreasM2 using the field table and calculation rules, then run the tool.
Read calibratedPpfdByStation, areaWeightedCalibratedPpfd. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
measuredLuxByStation	Measured lux by station	list of number	Required
callerMatchedMicromolesPerLuxSecond	Caller matched micromoles per lux second	list of number	Required
representedStationAreasM2	Represented station areas m2	list of number	Required

Enter aligned nonempty nonnegative lux, positive source-specific factors and positive represented station areas. Return station estimates and area-weighted mean.

PPFD[i]=lux[i]×matchedFactor[i]; pooled=sum(PPFD×normalizedArea)

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
calibratedPpfdByStation	Calibrated ppfd by station	list of number
areaWeightedCalibratedPpfd	Area weighted calibrated ppfd	number

json

{
  "input": {
    "measuredLuxByStation": [
      1000,
      2000
    ],
    "callerMatchedMicromolesPerLuxSecond": [
      0.01,
      0.02
    ],
    "representedStationAreasM2": [
      2,
      1
    ]
  },
  "output": {
    "calibratedPpfdByStation": [
      10,
      40
    ],
    "areaWeightedCalibratedPpfd": 20
  }
}

Limitations and assumptions

No universal lux conversion, spectrum identification or light-uniformity certification is provided.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use PPF to Lumens Converter: PPF counts photosynthetically relevant photons per second, while lumens weight light for human vision. Conversion depends on the source spectrum. For a complementary task, use Glazing Light Transmission Percent Calculator: Glazing transmission is best pooled by represented incident photon exposure. Equal weighting of ratios gives a different measure.

References

Lux to PPFD Converter — tool.io

Similar or alternative tools

PPF to Lumens Converter
PPF counts photosynthetically relevant photons per second, while lumens weight light for human vision. Conversion depends on the source spectrum.
Glazing Light Transmission Percent Calculator
Glazing transmission is best pooled by represented incident photon exposure. Equal weighting of ratios gives a different measure.