Illumination Converter

Illumination measures how much light falls on a surface and is key to design, safety and photography. The most common units are lux (lx), which measures illuminance per square meter, and foot-candle (fc), which measures illuminance per square foot. Converting between these units helps designers, photographers and facilities managers maintain appropriate lighting levels across international projects.

Conversion and examples: 1 foot-candle equals approximately 10.7639 lux. Typical recommended illuminance levels vary by task: a dimly lit corridor may need 50 lux, an office desk around 300–500 lux, and precision manufacturing tasks can require thousands of lux. Photographers often convert between metres- and feet-based measurements to match gear and exposure settings.

Practical uses: lighting designers use lux values to create lighting plans that meet building codes and user comfort needs; a homeowner choosing bulbs may compare lumen output and expected lux for a given room size; photographers reference foot-candles when using exposure meters calibrated in imperial units. Facility managers monitor illuminance to ensure safety and productivity in workplaces and schools.

Measurement notes: lux depends on both light output (lumens) and distribution (fixture optics and distance). When approximating room illuminance, divide fixture lumens by the area and adjust for fixture efficiency. For accurate results use a calibrated light-meter; this converter is intended for quick unit translations and planning estimates.

Historical context and tips: photometry developed alongside electric lighting and photography in the 19th and 20th centuries, creating standard units to compare lamps and designs. When documenting lighting, specify whether values are measured or calculated, include fixture positions, and use consistent units across plans to prevent miscommunication. This tool helps bridge unit systems and supports practical decision-making for design and safety.