Lighting Design Calculator
Calculate luminaire quantity and layout based on space requirements - IES / EN 12464 recommended levels
Space Information
Luminaire Information
Enhanced config: Utilization factor 0.55, maintenance factor 0.75, for dirty environments or special high-illuminance needs
This is a rough estimate — tap for notes
Luminaire Layout Plan
Cost Comparison Analysis
Material List
About Lighting Design Calculator
What is a Lighting Design Calculator?
The Lighting Design Calculator is a professional online tool that follows IES / EN 12464 recommended illuminance levels to help you calculate the required number of luminaires, layout plan, and energy costs for your space. Whether for residential renovation, office planning, retail design, or factory lighting, this calculator provides professional recommendations.
How to Use the Lighting Design Calculator?
- Select Space Type: Choose from preset options like living room, bedroom, office, etc. The system will automatically apply recommended illuminance standards
- Enter Space Dimensions: Fill in length, width, and ceiling height
- Select Luminaire Type: LED luminaires, T5 fluorescent, T8 fluorescent, etc., or customize specifications
- Set Usage Hours: Enter daily usage hours and electricity rate to calculate annual electricity cost
- View Results: The system automatically calculates required luminaires, layout plan, actual illuminance, and energy costs
Lighting Calculation Formula Explanation
Total Lumens Required Calculation:
Total Lumens (lm) = Illuminance (lux) × Area (m²) / (Utilization Factor × Maintenance Factor)
- Utilization Factor (UF): Standard 0.6, Enhanced 0.55 (considering luminaire efficiency, light distribution, and space reflectance)
- Maintenance Factor (MF): Standard 0.8, Enhanced 0.75 (considering luminaire aging, dust accumulation, and environmental cleanliness)
- This calculator uses conservative industry-standard values, referencing IES/CIE international lighting standards
Number of Luminaires Calculation:
Number of Luminaires = Total Lumens / Luminaire Output (rounded up)
Annual Electricity Cost Calculation:
Annual Cost = Total Power (kW) × Daily Hours (h) × 365 days × Electricity Rate ($/kWh)
Frequently Asked Questions
Q1: What are the recommended illuminance levels for different spaces?
A1: According to IES / EN 12464: Living room 150 lux, bedroom 100 lux, kitchen 300 lux, office 500 lux, drawing room 750 lux, precision work factory 1000 lux.
Q2: What is luminous flux (lumens)?
A2: Luminous flux (lm) represents the total light output from a luminaire. Higher values mean brighter. Common LED bulbs are around 800-1200 lm, LED panel lights around 3000-4000 lm.
Q3: Are LED luminaires really more energy efficient?
A3: Yes! LED luminaires save 60-80% energy compared to traditional lights. For example: For the same brightness, LED only needs 12W, while halogen needs 100W. Although LED has higher initial cost, long-term use pays back and continues to save on electricity.
Q4: How to choose appropriate luminaire power?
A4: Choose based on efficacy (lm/W): LED ~80-120 lm/W (best), T5 ~90-100 lm/W, T8 ~60-80 lm/W, halogen only 15-20 lm/W (worst).
Q5: Why should luminaires be evenly distributed?
A5: Even distribution avoids bright and dark spots, provides comfortable lighting environment, reduces glare and shadows. This calculator automatically calculates the optimal arrangement.
Lighting Design Tips
- 💡 Living rooms: 150-300 lux for cozy ambiance
- 💡 Kitchens: 300-500 lux for cooking safety
- 💡 Offices: 500-750 lux to protect vision and boost productivity
- 💡 LED luminaires have higher initial cost but significant long-term energy savings, recommended as first choice
- 💡 Recommended Ra > 80 for better color rendering
- 💡 Higher ceilings require more luminaires or higher lumen output
