Lighting Foot Candle Calculator Layout

Lighting Foot Candle Formula:

\[ FC = \frac{Lumens \times CU}{Area} \]

Foot Candle (FC):

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1. What is the Lighting Foot Candle Formula?

The Lighting Foot Candle Formula calculates the illuminance level in foot candles (FC) for a given lighting layout. It considers the total lumens output, coefficient of utilization (CU), and the area to be illuminated.

2. How Does the Calculator Work?

The calculator uses the Foot Candle formula:

\[ FC = \frac{Lumens \times CU}{Area} \]

Where:

\( Lumens \) — Total luminous flux emitted by the light source (lm)
\( CU \) — Coefficient of Utilization (0 to 1)
\( Area \) — Area to be illuminated (ft²)

Explanation: The formula calculates the illuminance level by accounting for the efficiency of light utilization and the distribution area.

3. Importance of Foot Candle Calculation

Details: Accurate foot candle calculation is crucial for designing effective lighting systems, ensuring adequate illumination for tasks, and optimizing energy efficiency in residential, commercial, and industrial spaces.

4. Using the Calculator

Tips: Enter lumens in lm, coefficient of utilization (between 0 and 1), and area in square feet. All values must be valid (positive numbers).

5. Frequently Asked Questions (FAQ)

Q1: What is a foot candle?
A: A foot candle is a unit of illuminance equal to one lumen per square foot, measuring the amount of light reaching a surface.

Q2: What is coefficient of utilization (CU)?
A: CU is a factor that represents the efficiency of a lighting system in delivering light to the work plane, accounting for light loss factors.

Q3: What are typical foot candle requirements?
A: Requirements vary by application: offices typically need 30-50 fc, retail spaces 50-100 fc, and detailed tasks may require 100-200 fc or more.

Q4: How does room reflectance affect calculations?
A: Room surface reflectance impacts the coefficient of utilization. Lighter colored surfaces typically result in higher CU values and better light distribution.

Q5: Can this calculator be used for outdoor lighting?
A: While the basic formula applies, outdoor calculations often require additional factors for atmospheric conditions, mounting height, and light pollution considerations.