1. What is the Luminous Flux Calculator?

Definition: This calculator determines the required luminous flux (in lumens) needed to properly illuminate a space based on desired illuminance level and area.

Purpose: Helps lighting designers, architects, and homeowners calculate the appropriate lighting requirements for any space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Φ \) — Luminous flux (lumens)
• \( E \) — Illuminance (lux)
• \( A \) — Area (square meters)

Explanation: The desired illuminance level is multiplied by the area to be illuminated to determine the total required luminous flux.

3. Importance of Proper Illumination Calculation

Details: Accurate calculations ensure adequate lighting for tasks, energy efficiency, and visual comfort while avoiding over-illumination.

4. Using the Calculator

Tips: Enter the required illuminance in lux (common values: 100-300 for general spaces, 500+ for task lighting) and the area in square meters.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between lux and lumens?
A: Lumens measure total light output (flux), while lux measures light intensity per unit area (1 lux = 1 lumen/m²).

Q2: What are typical illuminance requirements?
A: Living rooms ~100-200 lux, offices ~300-500 lux, detailed work ~750-1000 lux, retail ~1000-2000 lux.

Q3: Does this account for light loss factors?
A: No, consider multiplying the result by 1.2-1.5 to account for fixture efficiency, dirt depreciation, and other factors.

Q4: How do I convert square feet to square meters?
A: Multiply square feet by 0.0929 to get square meters.

Q5: Can I use this for outdoor lighting?
A: Yes, but outdoor requirements are typically lower (5-50 lux for pathways, 10-100 lux for parking lots).