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Foot-Candle
Lighting · Terms

Foot-Candle

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candle effect candelabra light meter

Professional lighting equipment or technique used in film and television production.

Definition

The Foot-Candle is a unit of illuminance used in film production. One Foot-Candle equals one lumen per square foot and measures how much light falls on a surface.

Practical Application

Gaffers use Foot-Candle measurements for:

  • Exposure Planning: Calculating correct camera settings
  • Light Ratio Control: Balancing Key Light and Fill Light
  • Continuity: Reproducing identical light levels between takes
  • Equipment Specification: Selecting appropriate lighting instruments for desired light intensity

Technical Details

Measurement Methods and Standards:

  • Measurement using an exposure meter or light meter
  • Typical values: Candlelight 1 fc, Office lighting 50 fc, Sunlight 10,000 fc
  • Conversion: 1 Foot-Candle = 10.76 Lux
  • Digital cameras require 5-50 fc for optimal image quality

Practical Tips

  • Perform measurements at actor's eye level
  • Calibrate light meter to camera position for object distance
  • Use reflected light measurement for precise exposure values
  • Ensure regular calibration of measuring devices

Professional Standards

Foot-Candle measurements enable:

  • Reproducible lighting setups across multiple shooting days
  • Precise communication between camera and lighting departments
  • Documentation of lighting setups for continuity
  • Standardized workflows in international productions
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