Ben Carter
Foot candles are a unit of measurement for light intensity, specifically the amount of light falling on a surface. They are important for lighting design and planning, allowing lighting designers to create comfortable, efficient, and practical lighting solutions. Foot candles are calculated by taking the lumen rating of a light source and dividing it by the surface area in square feet intended to be illuminated. This figure is then divided by the conversion factor of 10.764 to obtain foot candles. For example, a 1200-lumen lamp illuminating a space of 20 square feet would result in approximately 5.57 foot candles.
| Characteristics | Values |
|---|---|
| Definition | Foot-candles are a measurement of light intensity |
| Unit | fc, ft-c, or lm/ft2 |
| Equivalent Measurements | 1 foot-candle = 1 lumen per square foot = 10.76 lumens |
| Conversion to Lumens | Multiply foot-candles by 10.76 |
| Conversion to Lux | 1 foot-candle = approximately 10 lux or 10.57 lux |
| Use Cases | Architecture, lighting design, film industries, horticulture, museums, electrical construction, security requirements |
| Tools | Light meter, lighting plan software |
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What You'll Learn
Converting lumens to foot candles
Lumens and foot candles are both units of measurement for light. Lumens measure the total amount of visible light emitted by a source, while foot candles measure the intensity of light falling on a surface.
To convert lumens to foot candles, you need to start with the lumen rating of your light source. Then, divide that number by the surface area in square feet that you want to illuminate. This will give you the lumens per square foot. Finally, divide this figure by the conversion factor, 10.764, to get your foot candles.
For example, if you have a 1200-lumen lamp that you want to use to light a space of 20 square feet, you would first calculate the lumens per square foot. 1200 lumens divided by 20 square feet gives you 60 lumens per square foot. Then, you divide 60 by 10.764, which results in approximately 5.57-foot candles.
It's important to note that foot candles are crucial in lighting design and planning. They serve as benchmarks for determining the appropriate lighting levels in different spaces. For instance, an office desk typically requires about 50-foot candles, while a hallway may only need around 10-foot candles.
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Foot candles and lux
In practical terms, foot candles are used as benchmarks for gauging appropriate lighting levels in various spaces. 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 factors such as the specific tasks being performed and the age of the people using the space. Lighting designers use foot candles to tailor lighting levels to ensure both comfort and functionality.
The conversion factor between foot candles and lux is approximately 10.764. This means that one foot candle is equivalent to about 10 lux. To convert lumens to foot candles, you can divide the lumen rating of your light source by the surface area in square feet you intend to illuminate. This will give you lumens per square foot. Then, divide this value by the conversion factor to obtain the foot candles.
For example, if you have a 1200-lumen lamp that you want to use to light a space of 20 square feet, you would first calculate the lumens per square foot, which is 60. Then, dividing by the conversion factor gives you approximately 5.57 foot candles. This calculation is useful for determining if a space would benefit from a larger lumen output or a smaller area to better serve its intended function.
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Foot candles in lighting design
Foot candles are an important part of lighting design, providing a way to measure the intensity of light falling on a surface. This measurement is crucial for determining the amount of light required for various environments, ensuring that spaces are well-lit enough for their intended purpose. For example, an office desk may require 50 foot-candles, while a hallway might only need 10.
In lighting design, foot candles are used as benchmarks to gauge appropriate lighting levels. By measuring and planning according to foot candles, lighting designers can create lighting plans that ensure both comfort and functionality. This could be the ambient mood lighting in a restaurant or the bright clarity required in an operating room.
To convert lumens to foot candles, you can use the following calculation: take the lumen rating of your light source and divide it by the surface area in square feet you intend to illuminate. This gives you lumens per square foot. Then, to obtain foot candles, divide by the conversion factor, 10.764.
For example, if you have a 1200-lumen lamp lighting a space of 20 square feet, you first calculate 60 lumens per square foot. Then, dividing by 10.764 results in approximately 5.57 foot-candles. This lower foot candle level suggests that either a larger lumen output or a smaller area would benefit the space’s intended function.
Foot candles are also important for compliance and safety in workplaces. The Occupational Safety and Health Administration (OSHA) has specific foot candle requirements for certain spaces and industries to ensure that lighting is effective, adequate, and not excessively bright or glaring, which can cause headaches and eyestrain.
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Foot candles in film
Foot candles are an important unit of measurement in the film industry, used to measure the intensity of light falling on a surface. Cinematographers and photographers use this unit to determine the amount of light required for various environments, such as an office space, a residential interior, or a public sidewalk.
The term 'foot candle' originates from the amount of illumination produced by a single candle at a distance of one foot. This measurement is crucial in creating comfortable, efficient, and practical lighting solutions, forming the basis for multiple other lighting aspects.
In the film industry, foot candles (FC) are often used alongside lux, another unit of light measurement. The difference between the two is that FC is used in the imperial system, while lux is used in the metric system. One foot-candle equals 10.76 lumens or approximately 10 lux.
To convert lumens to foot candles, you can divide the lumen rating of your light source by the surface area in square feet you intend to illuminate. This will give you lumens per square foot. Then, divide this value by the conversion factor of 10.764 to obtain foot candles.
For example, if you have a 1200-lumen lamp and want to light a 20-square-foot area, you would divide 1200 by 20, resulting in 60 lumens per square foot. Finally, divide 60 by 10.764 to get approximately 5.57-foot candles.
Understanding foot candles is essential for filmmakers and photographers to master lighting techniques and create visually appealing images.
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Foot candles in horticulture
Horticulture enthusiasts and professionals alike may find themselves in need of guidance on lighting for plants. While there is no clear consensus on the light levels individual plants require, foot candles can be used to assess the lighting conditions in a space.
Foot candles are a unit of measurement for light intensity, or illuminance, on a given surface. They are frequently used in architecture, lighting design, and the film industry. One foot-candle is equivalent to one lumen per square foot, or approximately 10 lux. To convert lumens to foot candles, you can divide the lumen rating of your light source by the surface area in square feet you intend to illuminate, and then divide that figure by 10.764.
There are several tools available to help measure foot candles, including lighting plan software and light meter apps. For example, Light Meter is an iPhone app that can measure foot candles and help determine the placement of a new plant. Similarly, there are several YouTube videos by hydroponic/horticultural growers that can help with understanding light requirements.
By understanding the lighting conditions in a space, horticulturists can ensure that plants receive the light they need to survive and thrive.
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Frequently asked questions
A foot-candle measures the intensity of light falling on a surface, which is equivalent to the light cast by one candle from one foot away.
Foot candles allow us to determine the amount of light required for various environments accurately. It is important for creating comfortable, efficient, and practical lighting solutions.
To convert lumens to foot candles, start with the lumen rating of your light source, then divide it by the surface area in square feet you intend to illuminate. To obtain foot candles from this value, divide by the conversion factor, 10.764.
A foot candle calculator is a simple tool that allows you to estimate the number of fixtures you will need to properly light an interior space.
Foot candles and lux are both light measurement readings but are represented by different scales. Lux measures a one-meter square instead of a one-foot square.
