Tyler Brooks
Lumens and foot candles are both units of measurement for light. A lumen measures the total amount of light emitted by a source, while a foot candle measures the intensity of light or how bright it is. In British measurements, one foot-candle is equal to one lumen per square foot. Using the metric system, a lumen is measured by a square meter or a lux, so a foot-candle is equivalent to approximately 10 lux or 10.76 lux. This means that to convert foot candles to lumens, you multiply the number of foot candles by 10.76. For example, a 100-square-foot living room that needs 10-20 foot candles will need 1,000-2,000 lumens.
| Characteristics | Values |
|---|---|
| Foot-candles | A measurement of light intensity |
| Lumens | A measure of light energy |
| Foot-candles calculation | 1 lumen per square foot |
| Foot-candles in metric system | 1 lumen per square meter or lux |
| Lux | Equal to 10.76 lumens |
| Foot-candles in British system | Equal to approximately 10 lux or 10.57 lux |
| Foot-candles in US system | Equal to 10.76 lux |
| Lumens in British system | No equivalent |
| Lumens to foot-candles conversion | Multiply the number of foot candles by 10.76 |
| Foot candles for industrial lighting | Multiply the total number of lumens by 0.001496 |
| Foot-candles and lux | Represented by different scales |
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What You'll Learn
Lumens are a measure of light energy
The lumen is defined as equivalent to one candela-steradian (symbol cd·sr). If a light source emits one candela of luminous intensity uniformly across a solid angle of one steradian, the total luminous flux emitted into that angle is one lumen (1 cd·1 sr = 1 lm). The number of lumens from a source depends on its spectrum, via the nominal response of the human eye as represented in the luminosity function.
Luminous flux differs from power (radiant flux), which encompasses all electromagnetic waves emitted, including non-visible ones such as thermal radiation (infrared). By contrast, luminous flux is weighted according to a model (a "luminosity function") of the human eye's sensitivity to various wavelengths. This weighting is standardized by the CIE and ISO.
A foot-candle is a measure of light intensity, or how bright the illumination is when it strikes a surface. A foot-candle is equivalent to one lumen per square foot. This means that a foot-candle is a measure of the concentration of lumens in a given area. So, while lumens are a measure of the total amount of light emitted by a source, foot-candles are a measure of the intensity of that light in a specific area.
To calculate foot-candles from lumens, you would take the lumen rating of the light source and divide it by the square feet of the area that is illuminated. This will give you the foot-candles required for that area.
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Foot-candles are a measure of light intensity
Foot-candles are also used in cinematography to set up proper lighting-contrast ratios when filming. They are also used by horticulturalists to discuss optimum light intensity for various plants.
The foot-candle is defined as one lumen per square foot. This means that a foot-candle is the amount of light that illuminates a one-foot square with one lumen of light. This unit is commonly used in lighting layouts in parts of the world where United States customary units are used, such as the United Kingdom and the United States. In other parts of the world, such as Europe, the SI-derived unit "lux" is used, which is defined as one lumen per square meter.
Lumens are a measure of light energy and can be expressed in watts. Lumens are weighted using a standard curve that represents the average response of the human eye. Foot-candles, on the other hand, are a measure of light intensity. For example, you could take one lumen and concentrate it into a very small, laser-like beam, resulting in a relatively high foot-candle measurement because the light in that tight beam is very intense. Conversely, you could spread one lumen over a larger area, resulting in a lower foot-candle measurement because the light is less intense.
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One foot-candle equals one lumen per square foot
The lumen is a significant entity: it measures the total amount of visible light emitted by a source. All other measurements are based on the lumen. The lumen measurement originated from the basic concept of foot-candles.
A foot-candle is a measurement of light intensity. One foot-candle equals one lumen per square foot. This is a British measurement. Using the metric system, a lumen is measured by a square meter or a lux. Thus, a foot-candle is equivalent to approximately 10 lux or 10.76 lux.
To put it simply, a foot-candle relates to the amount of light that reaches a surface, whereas a lumen measures the quantity of light produced by a fixture. For example, a foot-candle relates to the amount of light that is on the ground surface beneath a parking lot light, rather than the output of the parking lot light.
Foot-candles are vital for measuring light intensity in commercial, industrial, and sports lighting. They define the required lighting levels for various environments, ensuring safety and functionality.
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Foot-candles are derived from the candle-making industry
The foot-candle is a unit of measurement for light intensity, defined as one lumen per square foot. It is a non-SI unit, with the SI-derived equivalent being lux, defined as one lumen per square meter. The foot-candle is derived from the candle-making industry, which provided a consistent, steady, clean, and efficient way to measure light when candles were the most common light source.
The concept of a foot-candle can be illustrated by imagining a candle set in the middle of a sphere with a diameter of 0.60 meters (2 feet). If we cut a one-square-foot hole in the centre of this sphere, the light that shines through is what we define as a lumen. This is where the unit of lumen originates from, and all other light measurements are based on it.
The lumen is a measure of the total amount of visible light emitted by a given source. Lumens are a measure of light energy, which can also be expressed in watts. However, lumens are weighted using a standard curve that represents the average response of the human eye. This means that while the curve may not precisely match an individual's eyes, it is standardised.
Foot-candles, on the other hand, are a measure of how much light reaches a surface area. For example, a foot-candle relates to the amount of light on the ground beneath a parking lot light, rather than the output of the light itself. This unit of measurement is particularly useful when specific light levels are required, such as in museums, horticulture, movie production, and security lighting.
While foot-candles are commonly used in the United States, most of the world uses the lux unit. However, foot-candles continue to be relevant in electrical construction and lighting design, ensuring that areas requiring certain light levels are receiving them.
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Higher lumens indicate brighter light
Lumens are a measure of light energy or light output, which can also be expressed in watts. Lumens are weighted using a standard curve that represents the average response of the human eye. The lumen measurement originated from the basic concept of foot-candles.
A foot-candle is a measure of light intensity, or how bright the illumination is when it strikes a particular object or surface. A foot-candle equals one lumen per square foot. This means that a higher number of lumens are indicative of a brighter, more intense light.
For example, if you have a light source with a narrow beam that emits 100 lumens, it will illuminate a smaller area more brightly than a light source with a wider beam emitting 150 lumens. This is because the light from the narrower beam is more concentrated, resulting in a higher foot-candle measurement.
In practical terms, if you are looking to replace a light bulb or want to know the lumen output of your lamp, you can refer to the product packaging or consult the luminaire catalogue. It is also worth noting that LED lights are more energy-efficient and can be much brighter than traditional incandescent or fluorescent bulbs, with some LED floodlights reaching up to 7500-9000 lumens.
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Frequently asked questions
A foot-candle is a measurement of light intensity, or how bright the light is one foot away from the source.
A foot-candle equals one lumen per square foot. To convert lumens to foot-candles, divide the lumens by the square feet of the area to be illuminated.
Multiply the room's square footage by its required foot-candles. For example, a 100-square-foot living room requiring 10-20 foot-candles will need 1,000-2,000 lumens.
