Description
Integrate a constant on-state PPFD over up to 24 hours with a supplied duty fraction; PPFD is in micromoles per square meter per second.
An indoor-growing record or design budget combines quantities such as tray area, operating time, water volume, electrical energy, and light output. Ratios depend on a stated production boundary and period. Supplied conversion factors and idealized geometry need to remain separate from measured equipment and crop performance.
Integrate a constant on-state PPFD over up to 24 hours with a supplied duty fraction; PPFD is in micromoles per square meter per second.
When to use this tool
Use Vertical Farm Light DLI Duty Factor when you need one stated production, lighting, water, or geometry term from a consistently defined growing-system budget.
How to use the tool and how it works
- Enter ppfd, hours, dutyFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read dliMolesPerM2. Use the output convention below.
Calculate dliMolesPerM2=ppfd*hours*dutyFraction*3600/1000000. Require nonnegative ppfd, hours from zero through 24, and dutyFraction within zero through one.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| ppfd | On-state PPFD in micromoles of photons per square meter per second. | Required. Finite number; minimum 0. |
| hours | Hours | Required. Finite number; minimum 0; maximum 24. |
| dutyFraction | Dimensionless on-state time fraction. | Required. Finite number; minimum 0; maximum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| dliMolesPerM2 | Daily light integral in moles per square meter for the supplied schedule. | Required. Finite number. |
{
"input": {
"ppfd": 200,
"hours": 16,
"dutyFraction": 0.5
},
"output": {
"dliMolesPerM2": 5.76
}
}Limitations and assumptions
- PPFD must be in micromoles of photons per square meter per second. This assumes a constant on-state intensity and scales it by duty fraction; it does not recommend a crop light target or model spectral response.
- The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Signed zero is exported as zero.
Alternative or Complementary methods
Compare the supplied budget with measured system records and keep the same production boundary. Equipment selection, installation, and crop requirements need an appropriate engineering or agronomic assessment.
References
Similar or alternative tools
- Light Duty Warmup Credit
Supplied lighting energy ledger under an explicit constant warmup-power approximation.
- Vertical Farm Crop Loss One Tray Term
Return unaccounted=initialCount-harvested-unmarketable-retained and harvestedShare=harvested/initialCount.