1. What is a Light Fixture Size Calculator?

Definition: This calculator determines the total lumens needed for a space based on desired illumination level and area size.

Purpose: It helps lighting designers, architects, and homeowners select appropriately sized light fixtures for any space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Lumens — Total light output needed (lm)
• FC — Desired illumination level (foot-candles)
• Area — Size of the space to be illuminated (ft²)

Explanation: The desired illumination level (in foot-candles) is multiplied by the area (in square feet) to determine the total lumens required.

3. Importance of Proper Lighting Calculation

Details: Correct lumen calculation ensures adequate lighting for tasks, enhances safety, improves energy efficiency, and creates desired ambiance.

4. Using the Calculator

Tips: Enter the desired illumination level (typical values: 10-20 fc for living spaces, 30-50 fc for workspaces, 75-100 fc for detailed tasks) and the area size in square feet.

5. Frequently Asked Questions (FAQ)

Q1: What are typical foot-candle requirements?
A: Living rooms: 10-20 fc, Kitchens: 30-40 fc, Offices: 50-75 fc, Retail spaces: 50-100 fc, Task lighting: 75-100+ fc.

Q2: How do I convert lumens to wattage?
A: Divide lumens by the fixture's efficacy (lm/W). LED fixtures typically provide 80-100 lm/W.

Q3: Should I consider multiple light fixtures?
A: Yes, distribute the total lumens across multiple fixtures for even illumination and reduced glare.

Q4: What about light loss factors?
A: For professional applications, multiply the result by 1.2-1.5 to account for light loss over time.

Q5: How does ceiling height affect this calculation?
A: Higher ceilings may require more lumens or directional lighting to achieve the same illumination at task level.