Tyler Brooks
A foot-candle is a unit of measurement for light intensity, commonly used to determine sufficient lighting levels for LED lighting projects. One foot-candle is equivalent to one lumen of light density per square foot, or approximately 10.76 lux. This unit of measurement is often used in commercial and industrial settings to ensure optimal lighting for various tasks and environments. For example, a typical office or classroom would require 10 to 20 foot-candles, while intricate work in a laboratory might demand 1,000 to 2,000 foot-candles. Foot-candle measurements are essential for achieving the desired brightness and distribution of light in any given space.
| Characteristics | Values |
|---|---|
| Definition | A foot-candle is a form of measurement that is commonly used to determine sufficient lighting levels for LED lighting projects. |
| Measurement | One foot-candle equals one lumen of light density per square foot. |
| Conversion to Lux | 1 foot-candle = 10.76 lux (rounded to 10 lux) |
| Lighting Requirements | Public areas surrounded by dark areas: 2-5 foot-candles; typical offices and classrooms: 10-20 foot-candles; offices with intensive use and showrooms: 50-100 foot-candles; intricate work: 1,000-2,000 foot-candles. |
| Exterior Spaces | 100-10,000+ foot-candles |
| Interior Spaces | 10-100 foot-candles |
| Measurement Tools | Light meters, lighting plan software |
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What You'll Learn
Foot-candles are a measurement of lumens per square foot
A foot-candle is a measurement of light intensity, or lumens per square foot. One foot-candle is defined as one lumen of light per square foot, or about 10.76 lumens. This unit of measurement is commonly used to determine the lighting levels for LED lighting projects and is especially important for electrical construction. It is also used to ensure that areas that require certain light levels are receiving those levels.
Foot-candles are most commonly used in places that follow the United States customary units of measurement. In other parts of the world, such as Europe, the SI-derived unit "lux" is used. Lux measures the number of lumens per square meter and one lux is equal to 0.0929 foot-candles.
The number of foot-candles required for a space depends on the activities carried out in the space and the space itself. For example, a bathroom or kitchen will require more foot-candles than a living room or bedroom. Similarly, an office or classroom will require more lighting than a public area surrounded by darkness.
To increase the lighting in a space, more lights can be added, or fixtures can be replaced with ones that have more lumens or are more efficient. A light meter is a useful tool for measuring the brightness and distribution of light in a space.
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Lux is the metric equivalent, measuring lumens per square metre
A foot-candle is a unit of measurement used to determine lighting levels, especially for LED lighting projects. One foot-candle is equal to one lumen of light density per square foot.
Lux is the metric equivalent of a foot-candle, measuring lumens per square metre. One lux is equal to one lumen per square metre. This is also referred to as the illuminance of a surface, or luminous flux per unit area.
To convert foot-candles to lux, simply divide your figure by 10.764. So, 1 foot-candle is equal to 10.76 lux.
The amount of lux in a given area or on a surface depends on the distance the light has travelled and the angle at which it is dispersed. The further light travels, the more it disperses. So, lux are concentrated in a smaller area when light travels a shorter distance and is more narrowly focused.
Lux are used to measure the brightness of lighting in a variety of settings. For example, public areas surrounded by dark areas generally require 20 to 50 lux, while typical offices and classrooms without highly detailed work will need 200 lux. Very intricate, exacting and detailed work may require 10,000 to 20,000 lux.
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One foot-candle equals 10.76 lux
A foot-candle is a form of measurement that determines the lighting levels for LED lighting projects. It is a measurement of lumens per square foot, with one foot-candle equalling one lumen of light density per square foot. In other words, one foot-candle can be defined as the amount of one lumen per square foot.
In the science of photometry, foot candles are a measurement of perceived light or brightness by a human. They are also referred to as scotopic lumens, which are a measure of the light perceived by the human eye. This is in contrast to photopic lumens, which are a measure of light by a device.
One foot-candle is equal to 10.76 lux or lumens. To convert lux to foot-candles, you divide your reading by 10.76. This means that 1 lux is equal to 0.093 foot-candles.
The Illuminating Engineering Society of North America (IES) has set guidelines for the recommended number of foot-candles for different rooms in a house. For example, public areas surrounded by dark areas generally require 2 to 5 foot-candles, while typical offices and classrooms without highly detailed work will need 10 to 20 foot-candles.
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Foot-candles are required by OSHA for workplace lighting measurements
Foot-candles are a measurement of lumens per square foot, with 1 foot-candle equalling 1 lumen of light density per square foot. This is the most common unit of measurement used by lighting professionals. The Occupational Safety and Health Administration (OSHA) uses this unit of measurement to set minimum lighting requirements for workplaces.
OSHA's lighting standards are designed to ensure workplace safety, and they vary depending on the type of work being carried out. For example, first-aid stations, offices, and infirmaries are required to have 30 foot-candles of illumination. General construction areas require a minimum of 5 foot-candles, while plants and shops need a minimum of 10. When drilling, mucking, and scaling are being performed, 10 foot-candles are also required. This lighting can usually be achieved with overhead lights, although cap lights are permitted in mines.
The amount of lighting needed in a space depends on the type of space and the tasks being performed. Exterior spaces typically require more lighting than interiors, with exterior requirements ranging from 100 to 10,000+ foot-candles, and interiors ranging from 10 to 100. More specifically, public areas surrounded by darkness generally require 2 to 5 foot-candles, while typical offices and classrooms need 10 to 20. Offices with intensive use and showrooms require 50 to 100 foot-candles, and very intricate work may need 1,000 to 2,000 foot-candles.
To measure the foot-candles in a space, a light meter is the best tool. These are available from many manufacturers at various price points.
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Foot-candles are essential for getting the right brightness for a space
Foot-candles are a measurement of lumens per square foot, with one foot-candle equalling one lumen of light density per square foot. This form of measurement is commonly used to determine the appropriate lighting levels for LED lighting projects.
When planning the lighting for a space, it is important to first consider how much lighting is required. This will depend on the type of space and the activities that will be carried out there. For example, a laboratory where detailed measurements are taken will require more lighting than a typical office or classroom. Similarly, a showroom or office with intensive use will need brighter lighting than a standard office.
The Illuminating Engineering Society of North America (IES) has set guidelines for the recommended number of foot-candles for different spaces. For instance, the IES recommends a foot-candle reading of 10 for a parking garage. In general, exterior spaces will require more lighting than interior spaces, with exterior lighting requirements ranging from 100 to over 10,000 foot-candles, and interior requirements ranging from 10 to 100 foot-candles.
To measure the foot-candles in a space, a light meter can be used. These are available from various manufacturers at different price points. The light meter will output readings in foot-candles or "lux", the metric measurement of lumens per square meter. If the foot-candles in a space are below the recommended guidelines, the lumens in the fixture can be increased or the fixture can be replaced with a more efficient one.
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Frequently asked questions
A foot candle is a form of measurement that is used to determine sufficient lighting levels. It is a measurement of lumens per square foot.
One foot candle equals 10.76 lumens or lux.
The lighting requirements for indoor spaces vary depending on the room and the activities performed. Public areas surrounded by dark areas typically require 2 to 5 foot-candles, while typical offices and classrooms need 10 to 20 foot-candles. Offices with intensive use and showrooms require 50 to 100 foot-candles, and intricate work may need up to 2,000 foot-candles.
Exterior spaces generally require more lighting than interiors, with requirements ranging from 100 to over 10,000 foot-candles.
You can use a light meter to measure foot candles. Place a light source in a room and walk around the room with the light meter to take foot candle measurements at different points.
