1. What is a Lighting Layout Calculator?

Definition: This calculator determines the number and placement of lights based on desired illuminance (foot-candles) and room area.

Purpose: It helps designers, electricians, and homeowners plan effective lighting for various spaces including shops, garages, workshops, and commercial areas.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Lumens} \) — Total light output needed (lumens)
• \( \text{FC} \) — Desired illuminance level (foot-candles)
• \( \text{Area} \) — Room area in square feet (ft²)

Explanation: The desired illuminance is multiplied by the room area to determine total lumens required, then divided by lumens per fixture to determine number of fixtures needed.

3. Importance of Proper Lighting Calculation

Details: Accurate lighting calculations ensure adequate illumination for tasks, energy efficiency, and proper fixture placement for uniform lighting.

4. Using the Calculator

Tips: Enter the desired foot-candles (default 30 fc for general spaces), room area in square feet, and lumens per fixture (default 3000 for LED shop lights). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical foot-candle requirements?
A: General spaces: 30-50 fc, Workshops: 50-75 fc, Detailed work: 75-100 fc, Retail: 100+ fc.

Q2: How do I find lumens per fixture?
A: Check manufacturer specifications or product packaging. Common LED shop lights are 3000-5000 lumens.

Q3: Does this account for light loss factors?
A: No, consider adding 10-20% to the calculated lumens for light loss due to aging, dirt, and other factors.

Q4: How do I determine fixture placement?
A: Divide the room into equal sections based on number of fixtures. For uniform lighting, space fixtures evenly.

Q5: What about different fixture types?
A: The calculator works for any fixture type (can lights, recessed, LED panels) as long as you know the lumens per fixture.