Tyler Brooks
Foot-candles are a unit of measurement used to calculate light intensity or brightness. They are used to ensure that areas requiring certain light levels are receiving them. Foot-candles are a measure of lumens per square foot, with one foot-candle equalling one lumen per square foot. Lumens, on the other hand, measure the amount of light produced by a fixture. This article will explain how to calculate foot-candles from lumens and discuss the importance of these measurements in various industries.
| Characteristics | Values |
|---|---|
| Foot-candle definition | A measurement of light intensity |
| Lumen definition | A measurement of the total amount of visible light emitted by a source |
| Foot-candle calculation | 1 foot-candle = 1 lumen per square foot |
| Foot-candle to lux conversion | 1 foot-candle = 10.76 lux |
| Lumen calculation | Multiply room square footage by room foot-candle requirement |
| Foot-candle applications | Commercial, industrial, sports lighting, horticulture, cinematography, museums, galleries |
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What You'll Learn
Foot-candles measure light intensity
Foot-candles are a measurement of lumens per square foot. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light. In other words, a foot-candle is the amount of light that illuminates a 1-square-foot surface from a source that's 1 foot away.
In the lighting industry, foot-candles are often used to measure light intensity alongside lumens and lux. Lumens measure the total visible light output from a source, indicating overall brightness, while foot-candles measure the light that reaches a surface. A higher number of lumens indicate brighter, more intense light, while a lower number of lumens represent dimmer, more subdued lighting.
Foot-candles are predominantly used in the United States, while other parts of the world, such as Europe, use the SI-derived unit called "lux," which measures light intensity over a one-square-meter area. One lux is equal to 0.092903 foot-candles, so to convert lux to foot-candles, divide the lux value by 10.764.
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Lumens measure the quantity of light produced
Lumens are a measure of the total amount of visible light emitted by a source. In other words, lumens measure the quantity of light produced by a fixture. The more lumens, the brighter the light, and the fewer lumens, the dimmer the light. Lumens are a far more accurate representation of a light's capacity than watts.
The lumen is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux is the measurement of total perceived power emitted in all directions by a light source. Luminous flux differs from power (radiant flux), which encompasses all electromagnetic waves emitted, including non-visible ones such as thermal radiation.
The lumen measurement originated from the basic concept of foot-candles. A foot-candle is a measurement of light intensity, or the amount of light that reaches a surface area. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light. Foot-candles are used to ensure that areas that require certain light levels are actually receiving those light levels.
If a space requires a certain number of foot-candles, you can increase the lumens in your fixture or replace the fixture with a new one with more lumens or more efficiency. For example, if the recommended foot-candles for a parking garage is 10, but your parking garage is only reading 7 foot-candles, then you need more lumens to brighten the space.
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Foot-candles are used in commercial lighting
Foot-candles are a measurement of light intensity, or illuminance, and are used to ensure that areas requiring certain light levels are receiving them. This is particularly important in commercial and industrial settings, where lighting needs to be safe and functional for employees, and efficient for the work being done.
In commercial lighting, foot-candles are used to measure the light that reaches a surface, while lumens measure the quantity of light produced by a fixture. One foot-candle is defined as one lumen per square foot, so to convert lumens to foot-candles, you multiply the number of lumens by 0.001496 or 0.092903, or simply 10.76 if rounding to the nearest hundredth.
For example, if you have a light fixture that emits 538 lumens, you can multiply that by 0.001496 to get 0.805 watts per square meter, or roughly 50 foot-candles. This means that the area one foot away from the fixture will be receiving 50 foot-candles of light.
The Illuminating Engineering Society of North America (IES) has set guidelines for the recommended number of foot-candles in different environments. For instance, the IES recommends a foot-candle reading of 10 for parking garages, 5 for storage spaces, and 200 for visually intensive work.
By using foot-candles to measure light intensity, businesses can ensure they are meeting lighting standards, providing a safe and comfortable environment for employees and customers, and achieving energy efficiency goals.
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Lumens are measured by a square meter or lux
Lumens are a measure of the total amount of light emitted by a source. It is a significant entity in lighting, as all other measurements are based on it. A lumen is a measure of light output, and the higher the number of lumens, the brighter the light.
The lumen measurement originated from the basic concept of foot-candles. A foot-candle is a measurement of light intensity, or the amount of light that reaches a surface area. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light. So, one foot-candle equals one lumen per square foot.
In the metric system, a lumen is measured by a square meter or a lux. A lux is a measure of illuminance, or luminous flux per unit area, in the International System of Units (SI). One lux is equal to one lumen per square meter. Essentially, as light travels from the emitter, it will disperse throughout an area. The further the light has to travel, the more it will disperse, so the amount of lux in an area or on a surface depends on the distance the light travels and the angle at which it is dispersed.
To convert foot-candles to lux, divide your lux reading by 10.764.
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Foot-candles are used to measure light safety
Foot-candles are a measurement of light intensity, or the amount of light that reaches a surface area. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light. This unit of measurement is used to ensure that areas that require certain light levels are receiving them.
In the lighting industry, foot-candles are often used alongside lumens and lux to measure light. Lumens measure the total amount of visible light emitted by a source, while foot-candles measure the amount of light that reaches a surface. One foot-candle equals one lumen per square foot.
Foot-candles are especially important in commercial, industrial, and sports lighting, where they are used to 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. For example, in sports lighting, foot-candles ensure optimal visibility for players and spectators. In work environments, higher foot-candle measurements can make tasks easier and reduce eye strain.
The Illuminating Engineering Society (IES) provides guidelines on recommended lighting levels for various environments, ensuring adequate illuminance for different spaces. For instance, outdoor walkways and parking lots typically need lighting levels between 2 to 10 foot-candles, while general office spaces and classrooms usually require about 10 to 20 foot-candles.
To measure foot-candles, a light meter can be used. These tools output their readings in foot-candles or lux, the SI-derived unit which measures a one-meter square.
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Frequently asked questions
Foot candles are a measurement of light intensity, or how bright the light is one foot away from the source. Foot candles are used to ensure that areas that require certain light levels are receiving them.
A foot candle is equal to one lumen per square foot. Lumens measure the quantity of light produced by a fixture. Foot candles are the imperial measurement, and lumens are the metric measurement.
To calculate foot candles from lumens, multiply the number of lumens by 0.001496. For example, 538 lumens x 0.001496 watts = 0.805 watts per square meter, so 50 foot-candles would equal 0.805 watts per square meter.
