Jessie Taylor
Lighting is an important aspect of any space, be it indoor or outdoor, and determining the right amount of light involves simple math. A foot candle (fc, ft-c, or lm/ft2) is a unit of measurement for light intensity, with one foot candle equalling one lumen of light per square foot. This unit is commonly used in places that follow the United States customary units of measurement. To calculate the required lumens for a space, one must first establish the intended use, then refer to the IES foot candle guide, and finally multiply the foot candle recommendation by the square footage of the space. For instance, a 100-square-foot dining room requiring 30-40 foot-candles will need 3,000-4,000 lumens.
| Characteristics | Values |
|---|---|
| Definition | A foot candle is a measurement of light intensity. |
| Unit | fc, ft-c, or lm/ft2 |
| Equivalent | 1 foot candle equals 1 lumen per square foot |
| Conversion | 1 foot candle = 10.76 lumens |
| Conversion (to lumens) | Multiply the number of foot candles by 10.76 |
| Conversion (to foot candles) | Multiply the number of lumens by 0.001496 |
| Calculation | Multiply room square footage by the foot candle requirement |
| Natural Lighting Situations | Twilight: 1 foot candle, Full moon: 0.01 foot candle, Overcast night: 0.00001 foot candle, Overcast day: 100 foot candles, Full daylight: 1,000 foot candles |
| Interior Spaces | 10-100 foot candles |
| Exterior Spaces | 100-10,000+ foot candles |
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What You'll Learn
Foot candles measure light intensity
Foot candles are a measure of light intensity, specifically the amount of light that reaches a surface. They are predominantly used in the United States, where they are the standard unit for measuring light intensity. One foot candle is equivalent to one lumen of light per square foot. This unit can also be expressed as fc, lm/ft², or ft-c.
Foot candles are especially relevant in settings where lighting standards are specified, such as commercial or industrial spaces. They are crucial for lighting design, helping to set the appropriate light levels for visibility, comfort, and safety. For example, office work areas may need 30-50 fc to reduce eye strain and enhance focus, while general warehouse storage areas need only about 10-20 fc.
To measure foot candles, a light meter is used. This meter is placed on the surface where the reading is needed, ideally at the height of the task area. For instance, a light meter can be placed on a workbench, desk, or floor. For consistency, measurements should be taken in a horizontal position, as foot candle measurements assume a surface directly receiving light.
Foot candles are also important in other contexts, such as museums, where specific light levels are needed to protect sensitive artifacts and create the right ambiance. In horticulture, foot candle readings ensure plants receive the appropriate type and amount of light. Laboratories are recommended to maintain foot candle levels between 75 and 120 to ensure scientists and researchers can conduct their work accurately.
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One foot candle equals one lumen per square foot
A foot candle, also known as fc, ft-c, or lm/ft2, is a measurement of light intensity. One foot candle equals one lumen per square foot. This means that a foot candle measures the amount of light that reaches a surface, while a lumen measures the quantity of light produced by a fixture.
To understand this better, consider the following example: if you have a 100-square-foot living room that needs 20 foot-candles, you will require 2,000 lumens. On the other hand, a 100-square-foot dining room that needs 40 foot-candles will require 4,000 lumens.
It is important to note that the lighting requirements for different spaces vary. For instance, a bathroom or kitchen will require more foot-candles than a living room or bedroom. This is because foot-candles are used to ensure that areas that require certain light levels are actually receiving those light levels. As a result, offices, manufacturing facilities, and workrooms need higher foot-candle measurements to make work less stressful on the eyes. Conversely, hallways and lobbies need lower foot-candle readings because the light does not need to be bright.
The use of foot-candles as a unit of measurement is most common in places that follow the United States customary units of measurement. In other parts of the world, such as Europe, the SI-derived measurement "lux" is used. Lux defines the area being lit as a one-meter square, while a foot-candle defines it as a one-foot square.
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Foot candles are required for workplace lighting measurements
Foot candles are a measurement of light intensity, with one foot candle equalling one lumen of light per square foot. This unit of measurement is important for ensuring safety and functionality in various environments, including commercial, industrial, and sports lighting.
Compliance with foot-candle standards is particularly important in workplace lighting, as it can have a significant impact on worker safety, productivity, and the quality of work produced. For this reason, foot candles are required by the Occupational Safety and Health Administration (OSHA) for workplace lighting measurements.
The specific number of foot candles required in a workplace will depend on the type of work being carried out. For example, general construction areas require a minimum of 5 foot-candles of illumination, while plants and shops need at least 10. The lighting requirements for a big-box store will differ from those of a packaging warehouse, even if the square footage is the same, as the activities carried out in each space differ.
To determine the number of foot candles required for a given space, one must first establish the intended use of the space, then reference the IES foot candle guide, and finally multiply the foot candle recommendation by the square footage of the space. For example, a 100-square-foot room that needs 20 foot-candles will require 2,000 lumens.
It is important to note that lighting plans should take into account not only the number of foot candles required but also the placement of lighting fixtures to ensure adequate lighting throughout the space.
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Foot candles are used to ensure areas that require certain light levels are receiving them
Foot candles are an important unit of measurement used to ensure that areas receive the specific light levels they require. Foot candles are a measure of light intensity, with one foot candle equalling 10.76 lumens or approximately 10.76 lux. This unit of measurement is particularly useful in commercial and industrial settings, as well as in sports lighting.
In commercial spaces, the lighting requirements can vary significantly depending on the nature of the work being conducted. For example, offices with more intensive use and showrooms typically require brighter lighting, with foot candle measurements ranging from 50 to 100. On the other hand, general office spaces and classrooms usually require lower light levels, with 10 to 20 foot candles being sufficient for tasks that need visibility without causing discomfort or eye strain.
In industrial settings, foot candle measurements are crucial for ensuring safety and functionality. For instance, commercial kitchens require a minimum of 60+ foot candles to ensure that chefs can prepare food safely and efficiently. Similarly, factories and gyms typically operate within a range of 40 to 55 foot candles, while laboratories need even higher levels, ranging from 75 to 120 foot candles, to facilitate precise and accurate work.
Foot candles are also essential in sports lighting, where they ensure optimal visibility for players and spectators alike. Additionally, foot candles play a critical role in horticulture, as they help ensure that plants receive the appropriate type and amount of light. Furthermore, organisations with physical security requirements, such as museums, rely on foot-candle readings to meet their unique lighting needs.
To determine the required number of lumens for a given space, one can multiply the square footage of the area by the foot candle requirement. This calculation helps ensure that the space receives the desired level of illumination. By using foot candles, lighting experts can design lighting effects that meet both functional and aesthetic needs, creating safe and productive environments.
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Lux is the metric equivalent of foot candles
A foot-candle is a unit of measurement used to quantify light intensity, or illuminance, in a given space. It is defined as the amount of light in square feet that reaches a surface. Foot-candles are used primarily in the United States and in industries such as commercial, industrial, and sports lighting.
Lux is the metric equivalent of foot-candles. It is the SI-derived unit of illuminance and is used worldwide. One lux is defined as the amount of light in square meters that reaches a surface. In other words, lux defines the area being lit as one square meter, whereas foot-candles define it as one square foot.
The conversion factor between lux and foot-candles is derived from the square meters to square feet ratio. Since one square meter is equal to approximately 10.76391 square feet, to convert lux to foot-candles, the lux value is divided by the conversion factor. For example, an illuminance measurement of 100 lux is equal to approximately 9.29 foot-candles. Conversely, to convert foot-candles to lux, the foot-candle value is multiplied by the conversion factor.
In the science of photometry, foot-candles are used to measure perceived light or brightness by the human eye. This is in contrast to radiometry, which measures all forms of radiant energy, including light, in absolute terms. Lux and foot-candles are both important for understanding lighting requirements, as they represent the level of illumination received on a surface.
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Frequently asked questions
A foot candle is a light intensity measurement, or how bright the light is one foot away from the source. One foot candle equals one lumen per square foot.
First, multiply the length and width of the room to get the room square footage. Then, determine the foot candles needed by room type. Finally, multiply the room square footage by the foot candle requirement.
To convert foot candles to lumens, multiply the number of foot candles by 10.76.
