Ben Carter
Foot-candles are a unit of measurement for light intensity, or illuminance. They are used to ensure that areas that require certain light levels are receiving them. Foot-candles are most commonly used in places that follow the United States customary units of measurement, such as in the US lighting industry, museum and gallery fields, and motion picture cinematography. Foot-candles are also used by organisations that have special lighting requirements, such as horticulture and physical security. The best tool for foot-candle readings is a sensitive light meter, which can be set to measure in foot-candles or lux.
| Characteristics | Values |
|---|---|
| Definition | Illuminance of the inside surface of a one-foot-radius sphere with a point source of one candela at its centre |
| Alternative Definition | Illuminance of one lumen on a one-square foot surface with a uniform distribution |
| Relation to Candela | One foot-candle is the illuminance produced by a standard candle that is one foot away from the subject |
| Relation to Lumen | One foot-candle equals one lumen per square foot |
| Relation to Lux | One foot-candle is approximately 10.764 lux or 10 lux |
| Unit of Measurement | Foot-candles are a non-SI unit of illuminance or light intensity |
| Usage | Foot-candles are used to ensure that areas that require certain light levels are receiving those light levels |
| Usage | Foot-candles are used in electrical construction, offices, manufacturing facilities, workrooms, hallways, lobbies, museums, horticulture, movie and video production, and security |
| Usage | Foot-candles are used by cinematographers to set up lighting-contrast ratios when filming |
| Tools | Light meters are used to measure foot-candles |
| Tools | Spectra can be set to measure foot-candles |
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What You'll Learn
- Foot-candles are used to ensure areas are receiving the required light levels
- Foot-candles are a unit of measurement for light intensity
- Foot-candles are used to calculate adequate lighting levels in US architecture
- Foot-candles are used to measure light as our eyes perceive it
- Foot-candles are used to determine the number of light fixtures needed
Foot-candles are used to ensure areas are receiving the required light levels
Foot-candles are a unit of measurement for light intensity or illuminance. They are defined as the illuminance of the inside surface of a one-foot-radius sphere with a point source of one candela at its centre. Alternatively, they can be defined as the illuminance of one lumen on a one-square-foot surface with a uniform distribution. This unit of measurement is used to ensure that areas are receiving the required light levels.
Foot-candles are especially useful in lighting design and planning. For example, an office desk is often lit at about 50-foot candles, while a hallway might require only 10. The exact number depends on the specific tasks being performed, the age of the people using the space, and other variables. By measuring and planning according to foot-candles, lighting designers can tailor lighting levels to ensure both comfort and functionality.
Foot-candles are also used in cinematography to calculate the intensity of motion picture lights, allowing cinematographers to set up proper lighting-contrast ratios when filming. They are also used by horticulturists to discuss and measure the optimum light intensity for various plants.
In addition, foot-candles are used in museums and galleries to ensure that lighting levels are carefully controlled to conserve light-sensitive artefacts. Organisations with physical security requirements also need to be aware of foot-candle readings in sensitive areas, such as around cameras and doors.
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Foot-candles are a unit of measurement for light intensity
The unit is defined as the illuminance produced by a standard candle positioned one foot away from the subject. This is also referred to as one lumen per square foot. A lumen is a measure of how much light a source emits, regardless of distance.
Foot-candles are especially useful for ensuring that areas requiring certain light levels are receiving those levels. For example, museums use foot-candles to ensure lighting is sufficient for visitors but not so high as to damage artefacts. Horticulturists use foot-candles to ensure plants receive the correct amount of light for photosynthesis.
Foot-candles are also used to measure the intensity of motion picture lights, allowing cinematographers to set up the correct lighting-contrast ratios when filming.
In the metric system, a lumen is measured by a square meter or a lux. One lux is equal to approximately 0.092903 foot-candles or 10.764 lux.
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Foot-candles are used to calculate adequate lighting levels in US architecture
Foot-candles are a unit of measurement used to calculate light intensity, defined as one lumen per square foot. They are primarily used in the United States, where they are employed to ensure that areas requiring specific light levels are receiving the appropriate amount of illumination. This is particularly important in architecture and interior design, where lighting requirements can vary significantly depending on the intended use of a space.
In the field of architecture, foot-candles are essential for determining adequate lighting levels in different areas of a building. For instance, offices, manufacturing facilities, and workrooms typically require higher foot-candle measurements to provide optimal lighting conditions for tasks such as reading or using a computer. On the other hand, hallways and lobbies usually need lower foot-candle readings since the lighting in these areas does not need to be as bright.
Foot-candle calculations are also crucial for ensuring compliance with safety regulations. Organisations like the Occupational Safety and Health Administration (OSHA) have established specific foot-candle requirements for certain industries and spaces to guarantee safe and adequately lit working conditions for employees. Glare and excessive lighting, for example, can lead to headaches and eyestrain over time, so proper lighting levels are essential for maintaining a healthy work environment.
Additionally, foot-candles are used in various industries beyond architecture to ensure the right amount of light is present. Museums, for instance, require specific light levels to create the desired ambiance and to prevent damage to sensitive artefacts. Horticulture also relies on accurate foot-candle readings to ensure that plants receive the appropriate amount and type of light. In the film industry, cinematographers use foot-candles to determine the lighting conditions for their shots, carrying light meters to measure foot-candles on subjects they plan to film.
To measure foot-candles, light meters are commonly used, with many affordable options available on the market. These meters typically output readings in foot-candles or lux, the SI-derived unit that measures light intensity over a one-meter square area. The conversion factor between foot-candles and lux is approximately 10.764, allowing for easy conversion between the two units.
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Foot-candles are used to measure light as our eyes perceive it
The foot-candle is defined as the illuminance of the inside surface of a one-foot-radius sphere with a point source of one candela at its centre. Alternatively, it can be defined as the illuminance of one lumen on a one-square-foot surface with a uniform distribution. One foot-candle is equal to approximately 10.764 lux, a unit of illuminance derived from the metric system. In many practical applications, such as when measuring room illumination, it is often sufficient to consider one foot-candle as about ten lux.
Foot-candles are used to ensure that areas requiring certain light levels are receiving those levels. This is important in electrical construction, especially in spaces such as offices, manufacturing facilities, and workrooms, which need higher foot-candle measurements to make work easier and less stressful on the eyes. Conversely, hallways and lobbies need lower foot-candle readings since the light doesn't need to be as bright.
Foot-candles are also used in horticulture to ensure that plants receive the appropriate amount and type of light. In the motion picture cinematography field, incident light meters are used to measure the number of foot-candles present, allowing cinematographers to set up proper lighting-contrast ratios when filming. In the US, foot-candles are used by architects to calculate adequate lighting levels and in museums and galleries to carefully control lighting to conserve light-sensitive artefacts.
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Foot-candles are used to determine the number of light fixtures needed
Foot-candles are a unit of measurement used to determine the amount of light falling on a surface. One foot-candle is approximately one lumen per square foot, or 10 lux. Lumens measure the total light emitted by a lamp, while foot-candles measure the light reaching a specific area. This is an important distinction, as not all emitted lumens will reach the intended surface.
Foot-candles are used to ensure that areas requiring certain light levels are receiving those levels. This is especially important in electrical construction, as different spaces have different lighting requirements. For example, offices, manufacturing facilities, and workrooms need higher foot-candle measurements to make work easier on the eyes, while hallways and lobbies need lower foot-candle readings.
Foot-candles are also crucial in certain industries with specific lighting requirements. For instance, museums need particular light levels to create the right ambiance and avoid damaging sensitive artifacts. Horticulture requires accurate foot-candle readings to ensure that plants receive the appropriate amount and type of light. Movie and video producers also use foot-candles to check the lighting on subjects they're going to shoot.
When choosing light fixtures, it is essential to consider both lumens and foot-candles. Lumens measure the total light emitted by a fixture, but foot-candles measure the actual light delivered to a surface. This is particularly relevant when choosing LED lights, as they are more efficient and will produce more light than an incandescent bulb of the same wattage. By comparing the foot-candles of your current fixtures with potential LED options, you can select a fixture that meets your lighting needs.
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Frequently asked questions
A foot-candle is a unit of measurement for light intensity or illuminance. One foot-candle is the illuminance produced by a standard candle that is one foot away from the subject.
Foot-candles can be measured using a light meter. Light meters are available from many manufacturers at various price points. The best light meter for foot-candle readings is one that is accurate and fast.
A lumen is a measure of how much light a source produces, while a foot-candle measures the light intensity a surface receives. One foot-candle is equal to one lumen per square foot.
