Fugitometer Equivalent Fading Years Estimator

Express measured fugitometer fading as a caller calibrated reference-equivalent exposure duration; same fade coordinate and linear local response assumed, no lifespan/reversibility guarantee.

Description

A fugitometer measures a chosen fading-coordinate change under exposure.

A fugitometer measures a chosen fading-coordinate change under exposure. Reference-equivalent duration uses a calibrated local response.

Express measured fugitometer fading as a caller calibrated reference-equivalent exposure duration; same fade coordinate and linear local response assumed, no lifespan/reversibility guarantee.

When to use Fugitometer Equivalent Fading Years Estimator

Use this tool to express measured fugitometer fading as a caller calibrated reference-equivalent exposure duration; same fade coordinate and linear local response assumed, no lifespan/reversibility guarantee.

Prepare the collection, exposure, scheduling or financial records required for this calculation. Keep row order and the declared units consistent.

How to use Fugitometer Equivalent Fading Years Estimator and understand its results

Prepare the collection, exposure, scheduling or financial records required for this calculation. Keep row order and the declared units consistent.
Enter observedFadeCoordinateChange, testLuxHours, referenceAnnualLuxHours, callerReferenceFadePerLuxHour using the field table and calculation rules, then run the tool.
Read observedFadePerLuxHour, equivalentReferenceFadingYears. 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
observedFadeCoordinateChange	Observed fade coordinate change	number	Required
testLuxHours	Test lux hours	number	Required
referenceAnnualLuxHours	Reference annual lux hours	number	Required
callerReferenceFadePerLuxHour	Caller reference fade per lux hour	number	Required

Use nonnegative change and positive test dose, annual reference dose and reference response. Return observed change per test dose and reference-equivalent years.^[1]

equivalent years = observed change/(reference fade per lux-hour × annual reference dose)

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

Output field	Meaning	Value type
observedFadePerLuxHour	Observed fade per lux hour	number
equivalentReferenceFadingYears	Equivalent reference fading years	number

json

{
  "input": {
    "observedFadeCoordinateChange": 2,
    "testLuxHours": 100,
    "referenceAnnualLuxHours": 1000,
    "callerReferenceFadePerLuxHour": 0.01
  },
  "output": {
    "observedFadePerLuxHour": 0.02,
    "equivalentReferenceFadingYears": 0.2
  }
}

Limitations and assumptions

The fade coordinate must match calibration; no lifespan, linearity outside the local regime or reversibility guarantee.

Numbers and computed results must be finite; overflow produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Reciprocity Law Failure Adjustment Factor Calculator: Apply caller experimentally calibrated intensity exponent relative to reference illuminance, exposing nonlinear versus linear exposure; no universal reciprocity-failure exponent or damage prediction. For a complementary task, use Light-Sensitive Object Annual Lux-Hours Budget Calculator: Account measured object light exposure and prior annual ledger against caller budget, retaining signed overspend; dose is not a material-safe limit.

References

Fugitometer Equivalent Fading Years Estimator — tool.io

Similar or alternative tools

Reciprocity Law Failure Adjustment Factor Calculator
Apply caller experimentally calibrated intensity exponent relative to reference illuminance, exposing nonlinear versus linear exposure; no universal reciprocity-failure exponent or damage prediction.
Light-Sensitive Object Annual Lux-Hours Budget Calculator
Account measured object light exposure and prior annual ledger against caller budget, retaining signed overspend; dose is not a material-safe limit.