What's the difference between lux and foot-candles?

Lux (lx) and foot-candles (fc) both measure illuminance, but use different measurement systems. 1 lux = 1 lumen per square meter (metric), while 1 foot-candle = 1 lumen per square foot (imperial). Since 1 foot = 0.3048 meters and 1 square foot = 0.0929 square meters, 1 foot-candle = 10.764 lux.

When should I use lux vs foot-candles?

Use lux (metric system) for international standards, scientific applications, and most modern lighting specifications. Use foot-candles (imperial system) in the United States, for photography, theater lighting, and when working with older equipment or specifications. The choice often depends on your location and industry standards.

How do I convert lux to foot-candles?

To convert lux to foot-candles, divide by 10.764. For example, 500 lux ÷ 10.764 = 46.4 foot-candles. To convert foot-candles to lux, multiply by 10.764. Our converter handles these calculations automatically with full precision.

What are typical lux levels for different activities?

Full sunlight: 100,000+ lux. Office lighting: 300-500 lux. Living room: 100-300 lux. Twilight: 10 lux. Full moon: 1 lux. Minimum reading light: 300 lux. Detailed work: 500-1000 lux. Our converter helps you understand and convert between these various lighting levels.

Why are both units still used today?

Both units persist because different industries and regions have historically used different measurement systems. Photography, theater, and some industrial applications in the US continue using foot-candles, while international standards, LED specifications, and scientific research primarily use lux. Our converter bridges these measurement systems for seamless communication.

Can I use this for measuring LED brightness?

Yes, but note that LED brightness specifications often vary. Some manufacturers use lux (for directional lights), others use lumens (total light output), and some use foot-candles for spot lights. Our converter helps translate between these measurements, but be sure to understand what type of measurement your LED specification represents.

Illuminance Converter

Convert illuminance measurements between lux and foot-candles for lighting design, photography, and architectural applications

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Convert between lux and foot-candles for lighting measurements.

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How it works: Converts between lux (SI unit) and foot-candles (imperial unit) for illuminance. 1 foot-candle = 10.764 lux. Used in lighting design, photography, and building standards.

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