Tenant lighting cost split notes
Tenant lighting cost split turns one total lighting kWh amount into share-based kWh and cost allocations.
Tenant split sequence
Enter one total lighting energy figure, then divide it across the shares and read each allocation.
- 1Enter the total kWh
Use one lighting total for the split.
- 2Add the rate
Enter the cents per kWh used for the estimate.
- 3Set Tenant A
Enter the first share percentage.
- 4Set Tenant B and common
Enter the remaining share percentages.
- 5Read the allocations
Keep the share total visible.
Application estimate fit
Match the search phrase to one lighting load, period and assumption set before reading the result.
| Search phrasing | Calculator case | Carry forward |
|---|---|---|
| Tenant lighting cost split | One total lighting kWh amount divided by share percentages. | Allocated kWh and cost for each share. |
| Common area split | A shared lighting total divided between tenants and common area. | Keep the shares visible on the same page. |
| Lease support note | A bounded allocation screen for an agreement or tenancy summary. | The total cost and each share allocation. |
| Three-way split | A total split between two tenants and a common portion. | The total share percentage kept visible. |
Reading the result
Each output belongs to a bounded lighting energy estimate and should travel with its assumptions.
| Output | Technical meaning | Review item |
|---|---|---|
| Total lighting cost | Total lighting kWh multiplied by the entered rate. | This is the base cost before allocation. |
| Tenant A share | Tenant A percent applied to kWh and cost. | Keep the share percentage visible. |
| Tenant B share | Tenant B percent applied to kWh and cost. | Keep the share percentage visible. |
| Common share | Common percent applied to kWh and cost. | Keep the shared portion visible. |
| Share total | Sum of the entered share percentages. | The shares should remain easy to check. |
Assumptions that stay visible
Small changes in load, hours, rate or factor can move the result, so the assumptions stay beside the number.
| Assumption | Why it matters | Where it belongs |
|---|---|---|
| Total lighting kWh | One total energy amount must feed the allocation. | Do not mix periods or load groups. |
| Share percentages | Each share should be entered as a percentage. | Keep the three shares visible together. |
| Energy rate | The cost value changes with the entered rate. | Write the rate beside the result. |
| Allocation scope | Use one shared basis for the whole split. | Do not blend unrelated spaces. |
shared lighting total before the number
A useful tenant lighting cost split estimate begins with the exact shared lighting total, not a whole-site average. The same building can include reception lights, display lights, warehouse aisles, amenity rooms and exterior signs that all run for different hours. Naming the group keeps the load, hours and money value tied to one visible lighting job.
That boundary also makes later revision easier. If the fittings, scene level or operating period changes, the row can be revised without rebuilding unrelated areas. Write the space name, fitting family and control group beside the result so another person can check the same case later.
Connected load remains the anchor
Energy and cost estimates move when connected load changes. Count the fittings or enter the load that belongs to the named group, then keep the wattage basis visible. Complete fitting input watts are stronger than a bare lamp value because drivers, control gear and luminaire packages can change the actual load.
The connected-load note does not prove the light level is suitable. A lower load can still be too dim, glary or uneven, while a higher load may support a harder task. Keep lux, beam, colour and measured-light pages nearby when the lighting quality also needs checking.
Hours carry much of the movement
The entered allocation basis can move the annual result more than a small wattage change. Seven-day corridors, hospitality scenes, office task rows, seasonal stores and after-hours security lights may all have different operating patterns even when the fittings look similar.
Enter the hours for the same lighting group named in the result. If the group has a normal scene and an after-hours scene, split those cases rather than hiding both in one average. A tidy input line with hours, days and control state is easier to revise than a single unexplained total.
Controls change energy without changing installed load
The same shared load basis can reduce energy by shortening operating time or lowering average output. Occupancy sensing, daylight dimming, timeclocks, scene presets and holiday shutdowns all change the energy case while the installed wattage may remain the same.
Keep full connected load and controlled operation visible as different ideas. That separation lets a user compare the installed capacity, the normal operating case and the reduced-energy case without implying that the electrical installation has changed.
Rates and factors are user-entered assumptions
The entered energy rate belongs beside the result because it can change while the lighting kWh stays fixed. A rate comparison, carbon estimate or simple payback note is only as current as the entered cents per kWh, emissions factor or annual saving value.
For Australian lighting notes, keep the rate date, account basis or factor source in the project file if the result will be reused. This page keeps the arithmetic transparent; it does not choose an electricity plan, account structure, rebate or finance outcome.
Read comparisons as bounded arithmetic
A share-based allocation across tenants and common area is helpful when the two cases share the same lighting group and schedule basis. Rate A and Rate B, old hours and new hours, or full output and dimmed output should describe the same load before the numbers are compared.
A comparison can show the size of a difference, but it does not decide whether the lighting change is appropriate. Light level, comfort, controls, maintenance access and site operating needs still need their own notes when they affect the decision.
Monthly, annual and period values are different
Monthly values are useful for a short period or a local cost note. Annual values are useful for longer operating schedules, carbon factors and simple payback. After-hours and shutdown values describe only the named period, not the whole lighting account.
Keep the period wording in the result. A monthly cost, an annual kWh value and a holiday shutdown saving should not be compared until the period, hours and days have been made consistent.
Australian energy estimate limits
tenant lighting cost split pages on AuLumens are planning estimates for lighting load, kWh, user-entered cost rates, carbon factors or simple payback. They do not model demand items, metered account totals, rebates, tax treatment, electrical design, emergency lighting or certification.
It is an allocation screen, not a lease clause or account issue decision. Keep account-specific charges, landlord agreements, emissions reporting basis and electrical installation details in the appropriate site file. The value of the lighting estimate is that it records the load, period and assumptions before those wider checks begin.
A concise calculation note
A readable note includes the lighting group, connected load, operating period, output state, user-entered rate or factor, and whether the result is monthly, annual or limited to a named period. For split cases, include both sides of the comparison.
Keep annual kWh and monthly cost pages nearby when the split also needs a period note. That context makes the result practical. Another person can change the hours, revise the rate, adjust the control state or compare the result with measured energy data without guessing how the original number was produced.