Lighting Layout Calculator

Number of Lights Formula:

\[ \text{Number of Lights} = \frac{FC \times Area}{\text{Lumens\_per\_light}} \]

Number of Lights:

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1. What is a Lighting Layout Calculator?

Definition: This calculator determines the number of light fixtures needed to achieve a desired illuminance level in a given space.

Purpose: It helps architects, electricians, and designers plan lighting installations for optimal illumination.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \text{Number of Lights} = \frac{FC \times Area}{\text{Lumens\_per\_light}} \]

Where:

\( FC \) — Required illuminance in foot-candles
\( Area \) — Area to be illuminated in square feet
\( \text{Lumens\_per\_light} \) — Light output per fixture in lumens

Explanation: The total required lumens (FC × Area) is divided by the lumens output per fixture to determine how many lights are needed.

3. Importance of Lighting Calculation

Details: Proper lighting calculation ensures adequate illumination for tasks, energy efficiency, and compliance with building codes.

4. Using the Calculator

Tips: Enter the desired illuminance (FC), area (ft²), and lumens per light (default 800 lm). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a foot-candle (FC)?
A: A foot-candle is a unit of illuminance equal to one lumen per square foot.

Q2: What are typical FC values for different spaces?
A: Offices: 30-50 fc, Retail: 50-100 fc, Warehouses: 10-30 fc, Kitchens: 30-75 fc.

Q3: How do I find lumens per light?
A: Check the manufacturer's specifications for your light fixtures.

Q4: Does this account for light loss factors?
A: No, consider multiplying the result by 1.2-1.5 to account for lumen depreciation and dirt accumulation.

Q5: Can I use this for outdoor lighting?
A: Yes, but outdoor calculations may need additional factors like mounting height and beam angle.