Tyler Brooks
Foot candles are a measurement of light intensity, with one foot candle equalling 10.76 lumens or 10 lux. This unit of measurement is commonly used to determine sufficient lighting levels for LED lighting projects. A space's lighting requirements will depend on the nature of the space and the activities being performed there. For example, a football stadium requires 50 foot candles on average, while a high school classroom requires 10-20 foot candles. 10 foot candles are equal to 100 lux, and this level of brightness is recommended for parking garages.
| Characteristics | Values |
|---|---|
| Foot-candles in simple terms | One lumen per square foot |
| Foot-candles in lux | 10.76 lux |
| Foot-candles in lumens | 10.76 lumens |
| 10 foot-candles in lux | 100 lux |
| Foot-candles in sports lighting | 20-50 foot-candles |
| Foot-candles in tennis court lighting | 30 foot-candles |
| Foot-candles in football stadium lighting | 50 foot-candles |
| Foot-candles in a typical office or classroom | 10-20 foot-candles |
| Foot-candles in an office with intensive use and showrooms | 50-100 foot-candles |
| Foot-candles in public areas surrounded by dark areas | 2-5 foot-candles |
| Foot-candles in intricate, detailed work | 1,000-2,000 foot-candles |
| Foot-candles in exterior spaces | 100-10,000+ foot-candles |
| Foot-candles in interior spaces | 10-100 foot-candles |
| Foot-candles in hallways and lobbies | Lower foot-candle readings |
| Foot-candles in a parking garage | 10 foot-candles |
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What You'll Learn
Foot candles are a form of measurement for lighting projects
In the science of photometry, foot candles measure the perceived light or brightness by a human. This is different from radiometry, which measures all forms of radiant energy, including light, in absolute terms. Photometry is important for businesses as it helps them understand the lighting experience of customers and staff in their buildings.
Foot candles are especially relevant for lighting in offices, manufacturing facilities, and workrooms, where higher foot-candle measurements can make work easier on the eyes. Conversely, hallways and lobbies typically require lower foot-candle readings as the light only needs to be bright enough to showcase the decor and prevent tripping hazards.
The recommended foot candles for a space depend on its purpose and specific lighting requirements. For instance, public areas surrounded by darkness generally require 2 to 5 foot-candles, while typical offices and classrooms without highly detailed work will need 10 to 20 foot-candles. More intensive office use and showrooms call for 50 to 100 foot-candles. For intricate, exacting, and detailed work, the lighting requirements can increase to 1,000 to 2,000 foot-candles.
When it comes to sports lighting, the foot-candle requirements vary depending on the sport and the level of competition. For example, a tennis court may average around 30 foot-candles for recreational or minor competition, while higher-level competitions may require 40 to 50 foot-candles. Similarly, a high school football stadium should have an average of 50 foot-candles, while college or high-level high school competitions require 75 to 100 foot-candles.
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1 foot-candle = 10.76 lux
A foot-candle is a unit of measurement that is used to determine lighting levels. It is defined as the amount of light received by a surface, with one foot-candle representing one lumen per square foot or approximately 10.76 lux. This unit of measurement is particularly useful for LED lighting projects and sports lighting.
In certain contexts, such as lighting for elderly retirees or intricate work, the required number of foot-candles can vary. For instance, while a typical office or classroom may require 10 to 20 foot-candles, an outdoor basketball court for recreational use would need about 30 foot-candles. Higher-level competitions might require up to 40-50 foot-candles. Similarly, a high school football stadium should have an average of 50 foot-candles, while college or high-level competitions would need 75-100 foot-candles.
The conversion factor between foot-candles and lux is based on the relationship between square feet and square meters. Since one square meter equals 10.76391 square feet, one lux, which represents the illuminance of one lumen per square meter, can be converted to foot-candles by dividing by this conversion factor. Therefore, 10 foot-candles, when converted to lux, would be equal to approximately 92.9 lux.
It is important to note that the lighting requirements for a space depend on various factors, including the intended use of the space, the age of the occupants, and the amount of surrounding darkness. For example, an outdoor public area surrounded by darkness may require fewer foot-candles than an office or classroom. Additionally, the direction, distribution, and colour temperature of light can impact the lighting requirements.
When designing lighting for a space, it is generally recommended to provide slightly more lighting than necessary to ensure adequate illumination for all occupants. However, exceptions exist, such as lighting for valuable artwork or artifacts, where excessive lighting could cause damage.
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Exterior spaces require more lighting than interiors
Lighting is an important aspect of any space, and the amount of lighting required varies depending on the area and its purpose. A foot-candle is a unit of measurement commonly used to determine appropriate lighting levels, with one foot-candle equalling approximately 10 lux.
Exterior spaces typically require more lighting than interiors. The lighting requirements for exterior spaces generally range from 100 to 10,000 or more foot-candles, while interiors usually require between 10 and 100 foot-candles. For example, a football stadium requires an average of 50 foot-candles for high school competitions and 75-100 foot-candles for college or high-level high school competitions. Similarly, basketball courts need 30 foot-candles for recreational or minor competitions and 40-50 for higher-level competitions.
There are several reasons why exterior spaces often need more lighting:
- Ambient Lighting: In exterior spaces, there is usually less control over ambient lighting due to the presence of natural light, which varies throughout the day and with weather conditions. Artificial lighting is used to complement natural light, fill in dark spots, and enhance specific areas.
- Task Lighting: Exterior spaces may require more task lighting to ensure adequate illumination for specific activities or tasks that require detailed work. For example, a laboratory conducting minute experiments would need more lighting than a typical office or classroom.
- Scale and Size: Outdoor areas are often more expansive than interiors, requiring more lighting fixtures to ensure even illumination. The height and size of the space play a crucial role in determining the number and placement of light fixtures.
- Direction and Distribution: In exterior spaces, the direction and distribution of light are critical to ensuring that areas are well-lit and safe. Proper lighting design can help reduce shadows and bright spots, creating a more comfortable and functional environment.
- Colour Temperature: The colour temperature of lighting can impact the ambiance and functionality of a space. Exterior lighting may need to consider different colour temperatures to enhance visibility and create a suitable atmosphere for various activities.
It is important to note that the lighting requirements can vary depending on the specific use case and environment. Additionally, other factors such as energy efficiency, sustainability, and the use of control systems also play a role in lighting design for both exterior and interior spaces.
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Lighting requirements vary depending on the space
Lighting requirements do indeed vary depending on the space. A foot-candle is a form of measurement that determines the sufficient lighting levels for LED lighting projects. One foot-candle can be considered 10 lux, which is the amount of one lumen per square foot.
For example, a workspace may require bright and focused lighting, while a relaxation area would benefit from softer, dimmable lighting. A bathroom or kitchen will require more foot-candles than a living room or bedroom. The lighting requirements for a typical office or classroom without highly detailed work are 10 to 20 foot-candles, or 200 lux.
When calculating lighting requirements, it is important to consider the purpose of the space, the colours and reflective properties of surfaces, the type and placement of light fixtures, glare, and the lighting technology used.
In terms of specific requirements, habitable spaces such as living rooms, dining rooms, kitchens, and bedrooms should have readily accessible wall-mounted dimming controls. All indoor lighting should be equipped with controls that can automatically reduce lighting power when the space is unoccupied. In addition, lighting controls should be installed to ensure that lighting power is reduced by a minimum of 90% when daylight illuminance is greater than 150% of the illuminance provided by the controlled lighting system.
Exterior spaces generally require more lighting than interior spaces, with requirements for exteriors ranging from 100 to over 10,000 foot-candles, while interiors usually require between 10 and 100 foot-candles. Sports applications, for example, usually require 20 to 50 foot-candles, with higher-level competitions needing 40 to 50 foot-candles.
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Foot candles are used to ensure the right amount of light touches objects
Foot candles are a unit of measurement used to determine the illuminance or light intensity of a given space. One foot-candle is defined as one lumen per square foot, or approximately 10.76 lux. This unit of measurement is typically used in the United States and other regions that follow US customary units.
Foot candles are particularly useful for ensuring that specific areas receive the required light levels. This is crucial in various settings, such as electrical construction, offices, manufacturing facilities, and workrooms. For example, offices with intensive use and showrooms demand brighter lighting, typically provided by 50 to 100 foot-candles.
The foot-candle measurement is essential for businesses as it helps them manage the lighting experience for customers and staff. It falls under the scientific field of photometry, which focuses on measuring light as our eyes perceive it. This is distinct from radiometry, which measures all forms of radiant energy, including light, in absolute terms.
The application of foot-candle measurements extends to diverse fields. For instance, in horticulture, precise foot-candle readings are necessary to ensure that plants receive the appropriate amount and type of light. Similarly, movie and video producers use foot-candle measurements to assess the lighting conditions for their subjects.
In summary, foot candles serve as a valuable tool to ensure that the right amount of light touches objects and spaces. This measurement aids in creating suitable lighting conditions for various purposes, from practical work environments to specialised fields like horticulture and film production.
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Frequently asked questions
A foot-candle is a form of measurement that is commonly used to determine sufficient lighting levels. One foot-candle can stand for the amount of one lumen per square foot or about 10.76 lux.
10 foot-candles are equal to 100 lux. This is the recommended lighting level for typical offices and classrooms without highly detailed work.
10 foot-candles are used in places like offices, classrooms, and public areas surrounded by darkness. It is also the recommended lighting level for a parking garage.
