1. What is a Lux to Foot Candle Calculator?

Definition: This calculator converts illuminance measurements from lux (lx) to foot-candles (fc).

Purpose: It helps lighting professionals, architects, and photographers convert between these common light measurement units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( FC \) — Foot-candles (fc)
• \( Lux \) — Lux value (lx)

Explanation: 1 foot-candle equals approximately 10.764 lux, as it's based on the illuminance from a uniform light source on a 1-square-foot surface from 1 foot away.

3. Importance of Lux to Foot Candle Conversion

Details: Different industries use different units - architects often use foot-candles while international standards typically use lux. Conversion ensures proper lighting design and compliance.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

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

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

Q3: Which industries use which units?
A: Foot-candles are common in US architecture, while lux is used internationally and in scientific contexts.

Q4: Can I convert foot-candles back to lux?
A: Yes, multiply foot-candles by 10.764 to get lux.

Q5: What's a typical lux value for office lighting?
A: About 500 lux, which equals approximately 46.5 foot-candles.