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.

Description

Light dose accumulates intensity over exposure time.

Light dose accumulates intensity over exposure time. An annual ledger makes previous dose and remaining budget explicit.^[1]

Account measured object light exposure and prior annual ledger against caller budget, retaining signed overspend; dose is not a material-safe limit.

When to use Light-Sensitive Object Annual Lux-Hours Budget Calculator

Use this tool to account measured object light exposure and prior annual ledger against caller budget, retaining signed overspend; dose is not a material-safe limit.

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

How to use Light-Sensitive Object Annual Lux-Hours Budget Calculator 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 observedLux, representedHours, priorAnnualLuxHours, callerAnnualLuxHourBudget using the field table and calculation rules, then run the tool.
Read addedLuxHours, annualLuxHours, signedRemainingLuxHours. 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
observedLux	Observed lux	list of number	Required
representedHours	Represented hours	list of number	Required
priorAnnualLuxHours	Prior annual lux hours	number	Required
callerAnnualLuxHourBudget	Caller annual lux hour budget	number	Required

Align nonnegative lux and represented hours with nonnegative prior ledger and annual budget. Return added, annual total and signed remaining dose, preserving overspend.^[2]

Paired lists must be nonempty and have equal lengths.

added lux-hours = Σ lux × hours; remaining = budget − prior − added

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

Output field	Meaning	Value type
addedLuxHours	Added lux hours	number
annualLuxHours	Annual lux hours	number
signedRemainingLuxHours	Signed remaining lux hours	number

json

{
  "input": {
    "observedLux": [
      50,
      100
    ],
    "representedHours": [
      100,
      200
    ],
    "priorAnnualLuxHours": 1000,
    "callerAnnualLuxHourBudget": 20000
  },
  "output": {
    "addedLuxHours": 25000,
    "annualLuxHours": 26000,
    "signedRemainingLuxHours": -6000
  }
}

Limitations and assumptions

Caller dose budgets are not automatically material-safe limits.

Numbers and computed results must be finite; overflow produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Exhibition Duration from Lux Budget Calculator: Invert an explicitly mixed daily lighting program into complete budget-compatible display days, not a universal recommended exhibition duration. For a complementary task, use Annual UV Dose Exposure Accumulator Calculator: Accumulate matched UV content×lux×hours with separate filter transmissions; conversion is 0.0036 J/m² per µW/m²-hour, not lux-hours alone or predicted fading.

Further background: Agents of deterioration: light, ultraviolet and infrared.

References

Agents of deterioration: light, ultraviolet and infrared — Canadian Conservation Institute
Light-Sensitive Object Annual Lux-Hours Budget Calculator — tool.io

Similar or alternative tools

Exhibition Duration from Lux Budget Calculator
Invert an explicitly mixed daily lighting program into complete budget-compatible display days, not a universal recommended exhibition duration.
Annual UV Dose Exposure Accumulator Calculator
Accumulate matched UV content×lux×hours with separate filter transmissions; conversion is 0.0036 J/m² per µW/m²-hour, not lux-hours alone or predicted fading.