What is the definition of a foot-candle?

A foot-candle is defined as a measure of light intensity. Specifically, it quantifies the amount of light that illuminates a surface one foot away from a uniform source of light, such as a candle. This unit is essential in various fields, such as photography, horticulture, and indoor lighting design, as it helps determine how much light is available for visibility and safety in different environments. Understanding foot-candles is important for ensuring adequate lighting in body art practices, where visibility is crucial for accuracy and safety.

The other choices do not accurately define a foot-candle. For example, it is not a unit of temperature, nor is it a type of decorative lighting. Additionally, it does not represent lumens per hour, as that would denote a measure of light output rather than intensity based on distance.