Maddie James
Foot-candles are a unit of measurement for light intensity, or illuminance, describing the amount of light reaching a specific surface one foot from the light source. This measurement is particularly useful for photographers, interior designers, and gardeners. To measure foot-candles, a light meter is often used, with some smartphone apps also able to estimate foot candles. While foot-candles are a useful tool, it's important to note that some apps may not be accurate in their measurements.
| Characteristics | Values |
|---|---|
| Name of the App | Light Meter - lux and foot candle measurement tool |
| App Store Rating | 5 stars |
| App Store Reviews | 2 |
| App Features | Realtime measurements, One-time measurement, Average and Max values, Indoor and outdoor modes, Front and rear cam, Lux and Foot candle measurements |
| App Description | Light meter in your pocket! The only app you really need to measure light intensity. Calibrated with professional Illuminometer. |
| App Developer | lspapps |
| App Developer Contact | [email protected] |
| App Price | $2 |
| App Updates | Bug fixes, Apple Watch app icon added |
| App Limitations | Not a replacement for a professional device, to be used for private purposes only |
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What You'll Learn
Foot candles and lumens
A foot candle is defined as enough light to saturate a one-foot square with one lumen of light. In other words, it measures light intensity, or the brightness of light, in a specific space. One foot-candle is approximately equal to 10.764 lumens per square foot. This means that to convert foot-candles to lumens per square foot, you multiply the number of foot-candles by 10.764. Conversely, you can find the number of foot candles from lumens by dividing the lumens by 10.764.
Lumens, on the other hand, represent the total light output from a source. Lumens are the amount of light given off by a light source. This means that while foot candles measure the amount of light that reaches a surface, lumens measure the quantity of light produced by a fixture.
Understanding the relationship between foot-candles and lumens is critical for light measurement, especially in commercial, industrial, and sports lighting. For example, foot candles define the required lighting levels for various environments, ensuring safety and functionality. In sports lighting, foot candles ensure optimal visibility for players and spectators.
There are various tools available to measure foot-candles and lumens. Sensitive light meters are a reliable tool for measuring foot-candles and are available from several manufacturers at different price points. Some light meters provide readings in foot-candles, while others provide readings in lux, which is a similar unit that measures light over a one-metre square rather than a one-foot square. Some advanced smartphone apps can also estimate foot-candles when a dedicated light meter isn't accessible. However, it is important to note that these apps may not provide accurate measurements as they approximate readings from camera data.
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Foot candles and lux
Foot-candles and lux are both units of measurement that describe the amount of visible light falling on a surface. The difference between the two is that the foot-candle uses the Imperial standard measuring system, while the lux uses the metric system. In other words, one foot-candle is the amount of light that falls on a surface one foot away from a single candle, and one lux is the amount of light that falls on a surface one metre away from a candle. To convert between the two units, simply divide or multiply by 10.764 (1 foot-candle = 10.764 lux).
Foot-candles and lux are especially important in photography, interior design, and gardening. For example, when growing high-light plants like succulents, it is recommended that they receive a minimum of 1000 FC (foot-candles). Some sources suggest that 3000-10,000 FC is even better for these plants.
There are several ways to measure foot-candles and lux. One way is to use a sensitive light meter, which can be purchased from several manufacturers at different price points. Light meters can be handheld and come in both analog and digital versions. They detect light on their sensors and provide readings in either foot-candles or lux.
Another way to measure foot-candles and lux is to use a smartphone app. For example, the "Light Meter" app on the Apple App Store uses the phone's camera to approximate light measurements. The app provides real-time measurements and can be used both indoors and outdoors. However, it is important to note that these apps are not always accurate and should be used for private purposes only.
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Foot candles in photography
A foot-candle is a unit of measurement that describes the amount of light reaching a specific surface, one foot from a light source. Foot-candles are a specialised unit used by cinematographers and lighting experts, and can be extremely useful for photographers.
The foot-candle is defined as one lumen per square foot. This is a non-SI unit of illuminance or light intensity, and is mainly used in the United States. The corresponding SI unit is lux, which is defined as one lumen per square metre. One foot-candle is approximately equal to 10.764 lumens per square foot.
Understanding foot-candles can help photographers to improve their lighting designs, whether for a workspace, a store, or an outdoor sports field. It's about knowing not just the amount of light a source emits but how that light is perceived in a specific space. For example, a foot-candle formula can be used to calculate the amount of light in a workspace. An 800-lumen light bulb illuminating a 15-square-foot desk would give about five-foot candles, indicating a dim workspace and suggesting the need for a higher-lumen bulb.
There are a few different ways to measure foot-candles. A reliable tool for measuring foot-candles is a sensitive light meter, available from several manufacturers at different price points. Some are as affordable as $20, while others cost $200 or more. Most light meters provide readings in either foot-candles or lux. Some advanced smartphone apps can also estimate foot candles when a dedicated light meter isn't accessible. However, it is important to note that these apps may not be as accurate as a professional light meter.
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Foot candles in gardening
A foot-candle is a unit of measurement that describes the amount of light reaching a specific surface, one foot from a light source. It is approximately the brightness of one candle. Foot-candles are important for determining the amount of light required for various environments.
In gardening, foot-candles are used to measure the intensity of light falling on a surface. Plants require different amounts of light depending on their type. For example, plants that adapt to low light will grow with only 100-300 foot-candles of light, while high-light plants like succulents need a minimum of 700-1200 foot-candles.
To measure foot-candles, you can use a light meter, which is a handheld device that detects light on its sensors and provides readings in foot-candles or lux. These meters are available from several manufacturers at different price points, with some being as affordable as $20. When using a light meter, it is important to position it directly facing the light source without any obstructions. It is also wise to take several measurements at different times of the day and compute an average, as light intensity fluctuates throughout the day.
Some smartphone apps can also provide a reasonable estimate of foot-candles if a dedicated light meter is unavailable. However, it is important to note that these apps may not be as accurate as light meters, as they approximate measurements from camera readings. One such app is the "Light Meter - lux and foot candle measurement tool" available on the Apple App Store.
By understanding foot-candles and their impact on plant growth, gardeners can create optimal lighting conditions for their plants, whether in a greenhouse, indoor garden, or outdoor space.
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Foot candles in interior design
A foot-candle is a unit of measurement that defines the intensity of light on a surface. It is a crucial concept in interior design, as it helps designers create specific atmospheres within a space. By understanding foot candles, designers can ensure that the lighting fixtures chosen meet the specific needs of each area. For instance, a residential space may require different foot-candle levels than a commercial space, considering factors such as activity and emotional tone.
In interior design, foot candles are used to measure the amount of light that reaches a surface. This is important because it helps designers understand how bright a light source is at a certain distance. This information is crucial in determining the lumen per square foot, ensuring that adequate lighting is provided in various environments. For example, intricate tasks such as surgery or fine art may require higher foot-candle levels, while casual settings like living rooms demand less.
There are several tools available to measure foot candles, including sensitive light meters and smartphone apps. Light meters are available at various price points, with some costing as little as $20, while others cost $200 or more. These handheld devices provide readings in foot-candles or "lux," which is a similar unit that measures light over a one-meter square rather than a one-foot square. Some advanced smartphone apps can also estimate foot candles when a dedicated light meter is not accessible. However, it is important to note that these apps may not be as accurate as light meters, as they approximate measurements from camera readings.
By using foot candles as a guiding principle, interior designers can tailor lighting solutions to enhance functionality and surroundings, ultimately improving the user experience. For example, research has shown that adequate lighting in offices can reduce eye strain and fatigue, leading to a more efficient and pleasant work atmosphere. Additionally, foot candle measurements can help create mood and focus attention in specific areas of a space, enhancing the visual storytelling and allowing for a more engaging experience for the audience.
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Frequently asked questions
A foot-candle is a unit of measurement for light intensity or illuminance. It measures the amount of light reaching a specific surface, one foot from a light source.
One foot-candle is approximately equal to 10.764 lumens per square foot. To convert foot-candles to lumens per square foot, multiply the number of foot-candles by 10.764. To convert lumens to foot-candles, divide the lumens by 10.764.
There are several apps available that can measure foot-candles. "Light Meter - lux and foot candle measurement tool" is one such app, available on the Apple App Store. Another app, "Lux Light Meter Free" by "Doggo Apps", is available on the Google Play Store.
