Maddie James
Foot-candles are a measure of light intensity, specifically, the amount of light that reaches a surface area. They are used to ensure that areas requiring certain light levels are receiving them. While foot-candles are an imperial unit of measurement, lux is the metric equivalent. Since lux is defined as one lumen per square meter, it would be advantageous to convert watts per square meter to lux first. However, it is important to note that foot-candles and watts measure different things, and therefore, cannot be converted directly.
| Characteristics | Values |
|---|---|
| Foot-candle definition | Measurement of light intensity |
| Foot-candle unit | fc, ft-c, lm/ft2 |
| Foot-candle conversion to lux | 1 foot-candle = 10.76 lux |
| Lux conversion to foot-candle | 1 lux = 0.0929 foot-candle |
| Lux definition | Measurement of lumens per square meter |
| Lumen definition | Measurement of light output created by one bulb, lamp, or fixture |
| Lumen conversion to foot-candle | 1 lumen = 1 foot-candle |
| Foot-candle conversion to watts | 1 foot-candle = 0.000000146 watt/centimeter^2 (at 555 nm) |
| Watts conversion to foot-candle | 1 watt/centimeter^2 (at 555 nm) = 634,527.7632 foot-candles |
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What You'll Learn
Foot-candles and watts measure different things
Watts, on the other hand, are a measure of power or energy consumption. Lumens, which are a measure of light output, are a far more accurate representation of a light's capacity than watts used to make light. A higher-quality LED with lower wattage can sometimes produce brighter light than one with higher wattage.
Foot-candles are important in various industries, including museums, horticulture, and video production, to ensure that specific light levels are achieved. They are also used in electrical construction to ensure that areas requiring certain light levels, such as offices, manufacturing facilities, and workrooms, receive adequate lighting.
While foot-candles and watts are different, there are calculations available to convert between the two. For example, to convert foot-candles to watts per square meter, you can multiply the number of foot-candles by 10.76 (lux) and then by 0.001496. However, some sources argue that direct conversion between the two units is not possible, just as one cannot convert between psi and pounds.
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Lux is the metric equivalent of foot-candles
Foot-candles and lux are both units of illuminance, specifically, the amount of light a surface receives. However, they are based on two different units. While foot-candles are the imperial measurement of lumens per square foot, lux is the metric measurement of lumens per square meter. In other words, foot-candles measure the amount of light in one square foot, while lux measures the amount of light in one square meter.
Lux is the SI-derived unit of illuminance and is used internationally. Foot-candles, on the other hand, are used most commonly in places that follow the United States customary units of measurement. The use of foot-candles ensures that areas requiring certain light levels are actually receiving those light levels. This is important in electrical construction, especially in offices, manufacturing facilities, and workrooms, which require higher light levels to make work easier on the eyes.
Understanding the distinction between lux and foot-candles is essential when designing lighting setups, calculating appropriate illumination levels, and assessing the efficiency of light sources. For example, the Illuminating Engineer Society (IES) recommends a foot-candle reading of 10 for a parking garage. Determining existing light levels can be done using a calibrated light meter.
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Lux measures lumens per square meter
Foot-candles and lux are both units of illuminance, or light intensity. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light. Lux, on the other hand, is a metric measurement, defining the area being lit as a one-metre square. One lux is equal to one lumen per square meter. Therefore, one foot-candle is equal to 10.76 lux.
Lux is the unit of illuminance in the International System of Units (SI), and is analogous to the radiometric unit watt per square meter. However, there is no single conversion factor between lux and watts per square meter; there is a different conversion factor for every wavelength, and it is not possible to make a conversion unless one knows the spectral composition of the light. The peak of the luminosity function is at 555 nm (green); the eye's image-forming visual system is most sensitive to light of this wavelength. For monochromatic light of this wavelength, the amount of illuminance for a given amount of irradiance is maximum: 683.002 lux per 1-watt per square meter.
The ratio between the actual number of lumens per watt and the theoretical maximum is expressed as a percentage known as the luminous efficiency. Luminous efficacy, or efficacy, is a measure of how efficiently a light source converts electrical power (watts) to light (lumens). It is expressed in lumens per watt (LPW) or lumens per circuit watt.
In commercial and industrial environments, specialized tasks may require illumination levels ranging from 1,500 to 20,000 lux. To achieve these levels, a greater luminous flux (lumen) is required. This is usually achieved by increasing the number of light fixtures, and hence the power consumed.
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1 foot-candle = 10.76 lux
A foot-candle is a measurement of light intensity, defined as enough light to saturate a one-foot square with one lumen of light. It is used to ensure that areas requiring certain light levels are actually receiving them. Lux is the metric equivalent of a foot-candle, with the lit area defined as a one-metre square. One foot-candle is equal to 10.76 lux. To convert lux to foot-candles, divide your reading by 10.76.
Foot-candles are used to measure the amount of light that reaches a surface area, rather than the amount of light that leaves the source. They are commonly used in museums, horticulture, film and video production, and physical security.
Lux is a measure of photometric intensity, or lumens per square metre. It is used in Europe and other parts of the world that follow the SI system.
It is important to note that foot-candles and watts measure different things, and therefore cannot be converted directly. However, there are formulae for converting foot-candles to watts/sq. cm at 555 nm.
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You can't convert foot-candles to watts directly
Foot-candles and watts measure different things, and therefore, cannot be converted directly. A foot-candle (fc, lm/ft2, or ft-c) is a measurement of light intensity, or lumens per square foot. It measures the amount of light that reaches a surface area. For example, a foot-candle relates to the amount of light on the ground beneath a streetlight, rather than the output of the streetlight itself. On the other hand, a watt is a unit of power, and measures the amount of light that leaves a light source (lumen output).
Since foot-candles and watts are fundamentally different measurements, it is not possible to convert between the two directly. This is similar to how one cannot convert between psi and pounds. While there is no direct correlation between lamp wattage and lumen data to the foot-candles provided at foot level, there are formulas that can be used to convert between foot-candles and watts, such as the following:
> Number of foot-candles x 10.76 (lux.) x 0.001496 to convert foot-candles into watts.
However, it is important to note that this formula is not a direct conversion, and other factors such as the installation height of the lighting fixture will impact the amount of watts required to achieve a certain level of illumination in foot-candles.
In addition, there are online tools and software that can be used to calculate the required number of foot-candles or watts. These tools take into account various factors such as the type of lamp and lens, reflectance off walls, and dust and cleanliness of the space.
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Frequently asked questions
You can convert foot candles to watts by multiplying the number of foot candles by 10.76 (lux) and then multiplying that figure by 0.001496.
A foot candle is a measurement of light intensity, or lumens per square foot.
Lux is the metric measurement of light intensity, or lumens per square meter.
Foot candles and watts measure different things, so there is no direct conversion factor. The conversion depends on the lamp type, wattage, luminaire type, mounting height, etc.
A lumen is a measurement of light output created by one bulb, lamp, or fixture. Lumens are a more accurate representation of a light's capacity than watts.
