Maddie James
Foot-candles and lux are both units of measurement for light intensity. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light. Lux, on the other hand, is defined as one lumen per square meter. While foot-candles are commonly used in the United States, lux is the standard unit of measurement in most parts of the world. Interestingly, one foot-candle is approximately equal to 10.764 lux. UV light, or ultraviolet radiation, is primarily produced by the sun, and its strength is measured using the UV Index. Light intensity, on the other hand, is measured in lux, with higher lux values indicating greater light intensity.
| Characteristics | Values |
|---|---|
| Foot-candle measurement in common use | Places that follow United States customary units of measurement, e.g. offices, manufacturing facilities, and workrooms |
| Lux measurement in common use | Europe and other parts of the world |
| Foot-candle definition | 1 lumen per square foot |
| Lux definition | 1 lumen per square meter |
| Foot-candle and lux conversion | 1 foot-candle = 10.764 lux or 10.57 lux |
| Foot-candle measurement use | Ensuring areas that require certain light levels are receiving them, e.g. museums, horticulture, movie and video production, physical security |
| Lux measurement use | Determining illumination level needed for various applications to achieve optimal light, safety, and visual comfort |
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What You'll Learn
Foot-candles are used in the US and Liberia
Foot-candles are a unit of measurement that measures light intensity, or the amount of light falling on a specific point or object. It is defined as one lumen of light per square foot. In other words, it is the amount of light that reaches a surface area.
Foot-candles are used most commonly in places that follow the United States customary units of measurement, such as the US and Liberia. In the US, foot-candles are a common unit of measurement used by architects to calculate adequate lighting levels. They are also used in the museum and gallery fields, where lighting levels must be carefully controlled to conserve light-sensitive objects. Horticulture requires very accurate foot-candle readings to ensure all plants receive the appropriate amount of light. Movie and video producers also use foot-candles to measure the light on subjects they are filming.
Foot-candles are important for commercial, industrial, and sports lighting, as they define the required lighting levels for various environments, ensuring safety and functionality. Compliance with foot-candle and lighting standards is essential for safe and adequately lit workplaces.
Foot-candles are also useful for designing effective lighting setups. They are the only way to tell if an area is receiving the intended light levels. This is important for employee safety and efficiency, as well as for creating the desired ambiance in a space.
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Lux is the metric measurement
Lux and foot-candles are both units of illuminance, measuring the amount of light falling on a specific point or object. However, they belong to different systems of measurement: foot-candles are the Imperial unit, while lux is the metric unit. One foot-candle is equal to one lumen per square foot, while one lux is equal to one lumen per square metre. In other words, a foot-candle measures the amount of light emitted by a one-candela source one foot away from a surface, while a lux measures the amount of light emitted by a one-candela source one metre away from a surface.
The use of each unit depends on the region and context. Foot-candles are commonly used in places that follow United States customary units of measurement, such as in electrical construction, offices, manufacturing facilities, and workrooms. On the other hand, lux is used in regions that follow the SI-derived system, such as Europe. The Illuminating Engineering Society of North America (IES) and other organisations have published guidelines and standards for specific lighting requirements in various environments.
Converting between lux and foot-candles is straightforward. Since a foot-candle is approximately 10.764 lux, you can divide your lux measurement by this number to get foot-candles. Conversely, multiply your foot-candle measurement by this number to obtain lux.
It is important to note that lux measures the intensity of light at a specific point, which may not provide a comprehensive understanding of the overall lighting in a space. Contextual information, such as the configuration of the light source and the distance from the measured point, is necessary to interpret lux measurements effectively.
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Lux is used in Europe
Lux and foot-candles are both units of illuminance, measuring the amount of light falling on a specific point or object. Foot-candles are the Imperial unit of measurement, commonly used in the United States, while lux is the Metric unit, used in Europe and other parts of the world. One foot-candle is equal to approximately 10 lux (or 10.57 lux or 10.764 lux, according to different sources).
In Europe, the metric system is used, and so lux is the standard unit for measuring illuminance. This is important for electrical construction and for ensuring that areas requiring certain light levels are receiving them. For example, offices, manufacturing facilities, and workrooms need higher light levels to make work easier on the eyes, while hallways and lobbies need lower light levels.
The use of lux as a unit of measurement in Europe is reflected in the name of the Lux Express, a coach service that operates in the Baltics, as well as the LUX Film Prize, formerly awarded by the European Parliament to films that raise awareness of socio-political issues in Europe.
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Foot-candles are used to ensure optimal lighting
Foot-candles are a unit of measurement used to quantify the amount of light falling on a specific point or object. In other words, it measures the light that reaches a surface. This is different from lumens, which measure the quantity of light produced by a fixture.
Foot-candles are a useful tool for businesses and organisations of all kinds because they help determine the amount of light falling on a given space. For example, museums use foot-candles to measure light levels to create the right ambiance and avoid damaging sensitive artefacts. Horticulture also requires accurate foot-candle readings to ensure that all plants receive the appropriate amount and type of light. Similarly, movie and video producers use foot-candles to check the lighting on subjects they're going to shoot.
Foot-candles are also important for electrical construction. Offices, manufacturing facilities, and workrooms require higher foot-candle measurements to ensure optimal lighting for work, making it easier on the eyes and reducing stress. On the other hand, hallways and lobbies need lower foot-candle readings since the lighting doesn't need to be as bright.
In commercial and industrial settings, foot-candles are vital for ensuring safety and functionality. Organisations like OSHA have developed lighting standards to ensure that workplaces have effective and adequate lighting without causing glare or excessive brightness, which can lead to headaches and eyestrain over time. Compliance with these standards is crucial for maintaining safe working conditions.
To measure foot-candles, light meters are commonly used. These meters provide readings in foot-candles or lux, the metric equivalent. By understanding the lighting requirements of different spaces and using tools like light meters, businesses can ensure optimal lighting conditions for various purposes.
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Lux is measured in lumens
Lumens are a standardised unit of measurement of the total amount of light emitted by a source. This is also referred to as luminous flux. Lumens are typically measured in a laboratory setting, using a goniosphere or integrating sphere to capture the light emitted in all angles. The lighting output of a light fitting is usually reported as a lumen output.
Lux, on the other hand, is a measure of how much light falls on a particular surface, and can be the result of multiple light bulbs or daylight. Lux is a measure of light density, or illuminance, and is quantified as lumens per square metre. Lux is the metric equivalent of the imperial foot-candle measurement. Lux is the more common measurement in Europe, whereas foot-candles are more common in the United States.
Foot-candles are a measure of lumens per square foot. A foot-candle equals one lumen per square foot. This means that a foot-candle is equivalent to approximately 10 lux. A higher number of lumens indicates brighter, more intense light.
The Illuminating Engineering Society of North America (IES) has set guidelines to determine the amount of lumens needed to light the various rooms of a house.
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Frequently asked questions
A Foot-Candle is a unit of measurement used to quantify the amount of light falling on a specific point or object. It is an Imperial measurement, commonly used in the United States and Liberia.
1 Foot-Candle is equal to approximately 10 Lux. To convert Foot-Candles to Lux, divide your Foot-Candle measurement by 10.764.
Lux is a metric measurement, used to quantify the amount of light falling on a surface. It is the SI-derived unit, commonly used in Europe.
Lumens measure the total amount of light emitted from a source. 1 Lux is equal to 1 Lumen per square meter, while 1 Foot-Candle is equal to 1 Lumen per square foot.
