Weighted scene kWh notes
Weighted scene kWh turns multiple scene levels into one daily and annual energy estimate for the same lighting group.
Scene weighting sequence
Describe the same lighting group, then split the day into scene states with different output levels.
- 1Enter the full load
Use the connected watts at full output.
- 2Set the annual days
Use the number of days the scene mix repeats.
- 3Enter scene 1
Add output percent and daily hours.
- 4Enter scene 2 and 3
Add the remaining output states and hours.
- 5Read the weighted result
Keep daily and annual kWh 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 |
|---|---|---|
| Weighted scene kWh | One full-load case with three scene levels and hours. | Daily weighted kWh and annual kWh. |
| Hospitality scenes | A room or venue with preset operating scenes. | Scene hours and output level for each state. |
| Home dimming scene mix | A room that spends different hours at different output levels. | Full output, dimmed output and night level. |
| Display or lounge scene set | A lighting group with a small number of repeated states. | Keep the scene mix fixed across the comparison. |
Reading the result
Each output belongs to a bounded lighting energy estimate and should travel with its assumptions.
| Output | Technical meaning | Review item |
|---|---|---|
| Annual scene kWh | Daily scene kWh multiplied by annual days. | Carry the scene mix and year together. |
| Daily scene kWh | Weighted scene load across the entered day. | This is the daily energy basis. |
| Weighted output | Time-weighted average output level. | This shows the overall scene mix in percent. |
| Scene hours | Total hours across the entered scene states. | Keep all scene hours visible. |
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 |
|---|---|---|
| Full load | The reference load when the lighting is at 100 percent. | Use the same load for all scenes. |
| Scene output | Each scene uses a percentage of full load. | Track scene levels and hours as paired values. |
| Scene hours | Hours per day are split across the three states. | Do not double count the same time. |
| Annual days | The same scene mix is repeated through the year. | Change the days if the scene pattern is seasonal. |
scene-based lighting group before the number
A useful weighted scene kWh estimate begins with the exact scene-based lighting group, 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
Scene hours across the day 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
Preset scene states 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 scene mix is an energy case, not a rate case 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
Multiple scene levels for the same load 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
weighted scene kWh 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 a planning estimate, not a control specification or scene schedule. 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 dimming-range and after-hours pages nearby when the scene mix needs a different control 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.