PPF to Lumens Converter

Translate actual source photon inventories using source-specific matched spectral photopic calibration; no universal PPF/lumen factor, inferred spectral distribution or canopy PPFD.

Description

PPF counts photosynthetically relevant photons per second, while lumens weight light for human vision.

PPF counts photosynthetically relevant photons per second, while lumens weight light for human vision. Conversion depends on the source spectrum.^[1]

Enter aligned nonempty nonnegative source PPF and positive source-specific calibration factors. Return source lumens and their total.

When to use PPF to Lumens Converter

Use PPF to Lumens Converter when you need to evaluate the supplied records under the calculation and evidence rules below. No universal conversion, spectrum recovery or canopy PPFD is supplied.

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 PPF to Lumens 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 measuredSourcePpfMicromolesSecond, callerMatchedLumensPerMicromole using the field table and calculation rules, then run the tool.
Read calibratedLumensBySource, combinedModeledLumens. 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
measuredSourcePpfMicromolesSecond	Measured source ppf micromoles second	list of number	Required
callerMatchedLumensPerMicromole	Caller matched lumens per micromole	list of number	Required

Enter aligned nonempty nonnegative source PPF and positive source-specific calibration factors. Return source lumens and their total.

lumens[i]=PPF[i]×matchedLumensPerMicromole[i]

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

Output field	Meaning	Value type
calibratedLumensBySource	Calibrated lumens by source	list of number
combinedModeledLumens	Combined modeled lumens	number

json

{
  "input": {
    "measuredSourcePpfMicromolesSecond": [
      100,
      200
    ],
    "callerMatchedLumensPerMicromole": [
      50,
      60
    ]
  },
  "output": {
    "calibratedLumensBySource": [
      5000,
      12000
    ],
    "combinedModeledLumens": 17000
  }
}

Limitations and assumptions

No universal conversion, spectrum recovery or canopy PPFD is supplied.

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 Lux to PPFD Converter: Lux describes human-vision illuminance, while PPFD describes photon flux per area. Matched spectral calibration is needed to relate them. 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

PPF to Lumens Converter — tool.io

Similar or alternative tools

Lux to PPFD Converter
Lux describes human-vision illuminance, while PPFD describes photon flux per area. Matched spectral calibration is needed to relate them.
Glazing Light Transmission Percent Calculator
Glazing transmission is best pooled by represented incident photon exposure. Equal weighting of ratios gives a different measure.