1. What is a Lux to Footcandles Calculator?

Definition: This calculator converts illuminance measurements from lux (lx) to footcandles (fc).

Purpose: It helps lighting professionals, architects, and engineers convert between these common units of illuminance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( FC \) — Footcandles (fc)
• \( Lux \) — Lux value (lx)

Explanation: 1 lux equals approximately 0.0929 footcandles, so we divide lux value by 10.764 (1/0.0929) for conversion.

3. Importance of Lux-Footcandles Conversion

Details: Different regions and industries use different units - lux (metric) vs footcandles (imperial). Conversion ensures proper lighting specifications.

4. Using the Calculator

Tips: Simply enter the lux value (must be > 0) and the calculator will provide the equivalent in footcandles.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between lux and footcandles?
A: Both measure illuminance, but lux is metric (lumens/m²) while footcandles is imperial (lumens/ft²).

Q2: Why is the conversion factor 10.764?
A: This comes from the square meter to square foot conversion (1 m² = 10.764 ft²).

Q3: When would I need this conversion?
A: When working with international lighting standards, American lighting specifications, or comparing different light sources.

Q4: What's a typical lux value for office lighting?
A: About 500 lux, which equals approximately 46.5 footcandles.

Q5: Is the conversion exact?
A: The conversion factor is precise, but real-world measurements may vary slightly due to measurement conditions.