Lighting Lux Calculator
Calculate the number of luminaires required to achieve target illumination levels using the lumen method. Includes room type presets, maintenance factors, and spacing recommendations.
Standard requirement: 500 lux
Efficacy: 100 lm/W
Enter room dimensions and lighting requirements to calculate
Notes:
- Calculations use the Lumen Method (CIE recommendations)
- Room Index affects light distribution efficiency
- Higher reflectance surfaces improve utilization
- Consider glare, uniformity, and color rendering for detailed design
- Emergency lighting may require additional fixtures
DISCLAIMER
This calculator provides ESTIMATES for preliminary planning purposes. Results are based on standard assumptions and may not reflect your specific project conditions.
By using this tool, you acknowledge that:
1. All calculations are approximate and based on typical industry standards and assumptions.
About This Calculator
The Lighting Lux Calculator helps electrical engineers and lighting designers determine the optimal number of luminaires required to achieve target illumination levels using the lumen method. Calculate lighting requirements for offices, warehouses, retail spaces, and industrial facilities across the UAE and Gulf. Includes room cavity ratio calculations, maintenance factors, and spacing recommendations per CIBSE and IESNA standards.
When to Use This Calculator
- Designing lighting layouts for commercial office spaces
- Calculating luminaire quantities for warehouse and industrial facilities
- Verifying compliance with workplace lighting standards (300-500 lux for offices)
- Preparing lighting tender specifications and BOQs
- Optimizing energy consumption through efficient lighting design
How to Use This Calculator
Enter Room Dimensions
Input length, width, and mounting height of the space to calculate room cavity ratio.
Select Target Lux Level
Choose from presets (office 500 lux, warehouse 200 lux, retail 750 lux) or enter custom value.
Specify Luminaire Data
Enter luminaire lumen output, coefficient of utilization (CU), and light loss factor (LLF).
Set Maintenance Factor
Apply maintenance factor based on environment (clean 0.8, normal 0.7, dirty 0.6).
Review Results
Get required number of luminaires, recommended spacing, and total connected load.
Typical Scenarios in UAE & Gulf Projects
An MEP consultant checks lighting for a 20 m × 20 m (400 m²) open office, 3 m ceiling, 0.8 m work plane, medium reflectances, at 500 lux (EN 12464-1 for office work). With 40 W LED panels (4,000 lm) and a maintenance factor of 0.8, the calculator estimates a utilisation factor of 0.70 and gives 89 luminaires in a 10 × 9 layout (about 2.0 m × 2.2 m spacing), 3.56 kW connected load (8.9 W/m²) and about 502 lux maintained.
A 100 m × 50 m (5,000 m²) logistics warehouse with a 12 m mounting height, at 200 lux. With 150 W LED high-bays (20,000 lm) and a maintenance factor of 0.8, the calculator gives 89 luminaires in a 13 × 7 layout (about 7.7 m × 7.1 m spacing), 13.35 kW (2.7 W/m²) and about 201 lux. Check the spacing-to-height ratio against the luminaire photometric data.
Frequently Asked Questions
Take Your Calculations Further
This calculator reflects the logic built into Arkan's construction management platform.
Last Updated: January 2026
Standards Reference: EN 12464-1, CIBSE Lighting Guide, IES Lighting Handbook