Electrical • Lighting Microsoft Excel (.xlsx)
Lighting Design (Lumen Method)
Luminaire count and spacing for target illuminance by the lumen method.
Download Excel Workbook (.xlsx)
Version 0.1
What this workbook is
A real, downloadable Microsoft Excel workbook — not a rendered demo. Every sheet is built around a single engineering method: inputs in one place, calculated results and a PASS / WARN / FAIL check sheet, with the method, sources and assumptions recorded next to the numbers. Open it in Excel, Sheets or LibreOffice, change the inputs, and the workbook recalculates.
- Light cells are user-entered inputs on the Inputs sheet.
- Dark cells are calculated automatically and are not editable.
- The method and sources for every calculation are listed below and inside the workbook.
What you enter
- ✓Area
- ✓Target lux
- ✓Lumens per luminaire
- ✓UF / LLF
What it calculates
- ✓Luminaire count
- ✓Spacing
- ✓Installed lux
Method
N = Eآ·A / (Fآ·UFآ·LLF)
Sources
- [1] Lumen method (CIBSE/IES lighting design guides, universal)
Inside the workbook
CoverTitle, scope and revision block
SummaryCore inputs and headline results
InputsYour project values (light cells)
CalculationsStep-by-step working sheet (dark cells)
OutputsReadback of results for reporting
ChecksPASS / WARN / FAIL against stated limits
ReferenceSources for each calculation
Notes & AssumptionsScope, exclusions and stated limits