Lamp Inventory Par
Calculate a lamp par level and reorder quantity from use, lead time, and safety stock.
Description
A lamp par level covers expected use during replenishment and the review period, plus safety stock.
A lamp par level covers expected use during replenishment and the review period, plus safety stock. Whole-unit rounding prevents a fractional stocking target.1
Calculate a lamp par level and reorder quantity from use, lead time, and safety stock.
When to use Lamp Inventory Par
Use this tool to calculate a lamp par level and reorder quantity from use, lead time, and safety stock.
Prepare production measurements or checklist records for one planning period. Confirm units, staffing assumptions and caller-selected criteria before running the calculation.
How to use Lamp Inventory Par and understand its results
- Prepare production measurements or checklist records for one planning period. Confirm units, staffing assumptions and caller-selected criteria before running the calculation.
- Enter averageWeeklyUse, leadTimeWeeks, reviewPeriodWeeks, safetyStock, onHand using the field table and calculation rules, then run the tool.
- Read parLevel, reorderQuantity. 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 |
|---|---|---|---|
| averageWeeklyUse | Average weekly lamp use (lamps/week) | number; minimum: 0 | Required |
| leadTimeWeeks | Replenishment lead time (weeks) | number; minimum: 0 | Required |
| reviewPeriodWeeks | Inventory review period (weeks) | number; minimum: 0 | Required |
| safetyStock | Safety stock (lamps) | integer; minimum: 0 | Required |
| onHand | Current on-hand stock (lamps) | integer; minimum: 0 | Required |
Enter nonnegative weekly use and time periods with nonnegative integer stock values. Return upward-rounded par and nonnegative reorder quantity. A surplus produces zero order.
par=ceil(weeklyUse×(leadWeeks+reviewWeeks)+safetyStock); order=max(0,par−onHand) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| parLevel | Recommended par level (lamps) | integer; minimum: 0 |
| reorderQuantity | Reorder quantity (lamps) | integer; minimum: 0 |
{
"input": {
"averageWeeklyUse": 4.5,
"leadTimeWeeks": 2,
"reviewPeriodWeeks": 1,
"safetyStock": 3,
"onHand": 8
},
"output": {
"parLevel": 17,
"reorderQuantity": 9
}
}Limitations and assumptions
The model assumes steady use and excludes incoming orders, variable lead time, lamp compatibility and supplier package sizes.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Mold Life Remaining: Track remaining mold life and defect-rate replacement status. For a complementary task, use Pixel-Map Capacity: Calculate pixel-map canvas size and control-universe capacity.
References
-
Lamp Inventory Par — tool.io
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