1. What is a Room Size Light Calculator?

Definition: This calculator determines the total lumens needed to properly illuminate a room based on desired light level (foot-candles) and room area.

Purpose: Helps homeowners, designers, and architects calculate lighting requirements for optimal room illumination.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Lumens} \) — Total light output needed (lumens)
• \( \text{FC} \) — Desired light level (foot-candles)
• \( \text{Area} \) — Room area (square feet)

Explanation: The foot-candle requirement is multiplied by the room area to determine the total lumens needed for proper illumination.

3. Importance of Proper Lighting Calculation

Details: Correct lighting calculations ensure adequate illumination for tasks, create comfortable environments, and help with energy-efficient lighting design.

4. Using the Calculator

Tips: Enter the desired foot-candle level (see reference values below) and room area in square feet. All values must be > 0.

Typical FC Requirements:

• General residential: 10-20 fc
• Kitchen work areas: 30-40 fc
• Office workspace: 30-50 fc
• Retail spaces: 50-100 fc

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between lumens and foot-candles?
A: Lumens measure light output, while foot-candles measure light received at a surface (1 fc = 1 lumen/ft²).

Q2: How do I convert lumens to watts?
A: Divide lumens by the efficacy (lm/W) of your light source (e.g., 800 lumens / 80 lm/W = 10W LED bulb).

Q3: Should I account for light loss factors?
A: Yes, consider adding 20-30% more lumens to account for light loss due to fixture efficiency, dirt, and room surfaces.

Q4: How do I distribute multiple light fixtures?
A: Divide total lumens by the lumen output per fixture to determine number needed, then space evenly.

Q5: Does room color affect lighting needs?
A: Yes, dark-colored rooms may need 10-20% more lumens than calculated, while light rooms may need less.