⚡ CircuitSecrets
Lighting Design Calculator
Professional illumination design — fixture count, lux level, power load, energy cost & room visualization per IEC/CIE standard
Lumen Method
CIE Standard
Room Index
Power Load
Energy Cost
Utilization Factor
Lumen Method
Lighting Input
Room Type
Living
Office
Kitchen
Bedroom
Workshop
Custom
Room Dimensions
Fixture Type
LED Bulb — 800lm / 9W
LED Tube — 1600lm / 18W
Panel Light — 3000lm / 36W
CFL — 1200lm / 23W
Highbay — 10000lm / 100W
Custom fixture
Advanced Options
Design Result
Lighting Analysis
Enter dimensions
► Lumen Method Formula
CIE Lumen Method
Total Lumens = E × A / (UF × MF)
Fixtures = Total Lumens / Lumens per fixture
Room Index K = L×W / (H×(L+W))
Power Load = N × Watts per fixture
E: Target lux A: Floor area (m²)
UF: Utilization factor MF: Maintenance factor
CIE / IEC Reference
Recommended Lux Levels
| Space Type | Min Lux | Typical Lux | High Lux | Standard |
|---|---|---|---|---|
| Corridor / Passageway | 50 | 100 | 200 | CIE S 008 |
| Bedroom | 50 | 100 | 150 | CIE S 008 |
| Living Room | 100 | 150 | 300 | CIE S 008 |
| Office (General) | 200 | 300 | 500 | EN 12464-1 |
| Office (Drawing/CAD) | 500 | 750 | 1000 | EN 12464-1 |
| Kitchen (Residential) | 300 | 500 | 750 | CIE S 008 |
| Kitchen (Commercial) | 500 | 750 | 1000 | EN 12464-1 |
| Retail / Shop | 300 | 500 | 1000 | EN 12464-1 |
| Workshop / Factory | 300 | 750 | 1500 | EN 12464-1 |
| Hospital Ward | 100 | 300 | 500 | EN 12464-1 |
| Operating Theatre | 1000 | 10000 | 100000 | EN 12464-1 |
| Outdoor (Road) | 5 | 10 | 30 | CIE 115 |
⚠ Note: Calculations use the Lumen Method per CIE guidelines. Actual lighting performance depends on fixture placement, reflectance of surfaces, obstructions and specific fixture photometric data. Consult a qualified lighting designer for critical applications.
