Hallways and lobbies need lower foot-candle measurements because the light source simply has to provide enough lighting to prevent injury but is not harsh enough to cause discomfort.

The idea of using foot-candles is to ensure that areas that require certain levels of light are actually receiving them. For example a foot-candle relates to the amount of light that is on the ground beneath a parking lot light, opposed to the amount of light being produced by the parking lot light. This can be very important for both commercial and industrial spaces.

Your retina turns light into electrical signals. Your brain receives these signals and turns them into images. This is how you’re able to see.

Foot-Candles as a unit of measurement are used most commonly in the United States and other places that follow our customary units of measurement. In other parts of the world, such as Europe, the SI-derived measurement is called “lux”.

Stray light is any light reaching the detector that lies outside the wavelength band width selected for analysis by the monochromator. It arises due to light ...

The pupil of your eye is the black hole in the middle of your iris. Your iris is the colored part of your eye. Muscles in your iris control how big the pupil is. Usually, this happens as a result of how much light is available. This makes the pupil an important part of your vision system.

The pupil has protection. The cornea is a clear dome over the eye that covers the pupil and provides protection. Another layer of tissue called the conjunctiva also protects the pupil and the whole eye.

All other lighting units of measurements are based on the lumen. The lumen measurement originated from the basic concept of foot-candles.

A Lumen (lm) is the most common measurement you will see when shopping for LED lighting. Lumens are scientifically defined as "the International System of Units derived unit of luminous flux, a measure of the total 'amount' of visible light emitted by a source." This means a lumen is a measure of the total visible light output of a light source.  Lumens are the amount of light generated by a light fixture, NOT the amount of light reaching the intended surface.

Your pupil lets light into your eye as the muscles of your iris change its shape. The lens in your eye focuses light that passes through your pupil. Light then goes to the back of your eye and hits your retina.

The light waves are refracted close refractionProcess by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, eg a ...

When you’re in bright light, your pupil constricts and gets smaller. When the light is dim, your pupil dilates and gets bigger. The name of this reaction is the pupillary light response.

Other forms of medications may come in oral form (pills, capsules or liquids). You’ll get some drugs as an injection (a shot) and others through a vein (intravenously or IV).

The first question we are often asked is “How much light do I need?” Our standard response is to ask about the needs and usage of the building or facility. We can get more specific by referencing the number of foot-candles or lux for a specific distance. However, unless familiar with the lighting industry terminology, “lumen”, “lux”, and “foot-candle” often lead to more confusion than solution.  Understanding these terms enables the understanding of a Photometric Layout, which is the most important tool in designing a lighting project.

Foot-candles are directly affected by the distance from the source of lumens and can be expressed in a simple formula. One foot-candle is equivalent to the amount of light needed to saturate a one-foot square with one lumen of light (1 Foot-Candle = 1 lm/ft^2). This means that one foot-candle is equivalent to 10.76 lux.

The pupil is the black opening in the middle of the colored part of your eye (iris). The pupil gets bigger or smaller in response to changes in light. Muscles in the iris control the size of the pupil. Pupil issues can suggest certain diseases.

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Nerves that affect the pupil connect to the afferent pathway (the path from your eye to your brain). They also connect to the efferent pathway (the path from your brain to your eye).

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Manufacturers of traditional lighting use the term “Watts”, which actually identifies the amount of power consumed, as a means of describing the visible output of light from the bulb. But now with the need for increased energy efficiency through the use of LED lights, the measurement unit of Watts does not work anymore.

So when it comes to changing from traditional incandescent lighting to LED lighting or any other energy saving bulb, it is the number of lumens that represents the brightness, not the wattage. The higher the lumens, the brighter the light.

Two muscles in your iris control how you pupil opens and closes. The iris dilator muscle opens your pupil from the inside out. It sort of looks like a sun with rays extending out from the middle. The iris sphincter is a circular muscle that controls closing your pupil.

Your pupils are important parts of your vision system. Problems with your pupils can point a healthcare provider toward a diagnosis of other illnesses. See an eye care specialist as often as they suggest. It’s also good to do what you can to keep yourself and your eyes healthy.

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The pupil also gives aqueous humor a pathway to the front of your eye. Aqueous humor is a fluid that nourishes your eyes.

A Lux (lx) is the standardized unit of measurement of light intensity. Similar to a foot-candle, a lux is simply another unit used to measure the illuminance or amount of light falling on a surface. A lux is measured using the number of lumens in the bulb, taking into account the amount of visible light falling on the surface. So one lux is equivalent to the amount of light needed to saturate a one-meter square with one lumen of light (1 Lux = 1 lm/m^2).

Treating eye conditions depends on what’s causing them. For instance, if your current medication affects your pupils, a provider may suggest that you stop taking that drug or substitute another medicine.

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In general, each one of our signs or lights provides illumination via heat, electrical energy, or sub-atomic motion.

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A Foot-Candle (fc) is the non-SI unit of light intensity. A single foot-candle is defined as the amount of light that falls on a surface one foot away from the single candle. This unit of measurement would tell us how much of the light that leaves the fixture arrives at the surface where it is needed. Foot-Candles are the most important unit of measurement when comparing or evaluating lighting.  They can be used to compare different lighting technologies (such as LED vs Metal Halide), as well as comparing how different LED Light fixtures perform in any space.

So when answering your questions about “How bright is my lighting fixture’s LED light bulb?” or “How much area does one lighting fixture cover?” we will need to properly assess your lighting needs in accordance with these three lighting measurement units.

A variation in pupil size can be an issue itself or a symptom of other conditions. Common conditions of the pupil of the eye include:

In this post we will be defining and breaking down the calculations of each lighting measurement unit. As lighting technology changes, the standard measurement of “brightness” for traditional lighting is not able to be translated to determine how much light you will need with an LED light.

Each time you switch to a higher power, the depth of focus is reduced. Therefore a smaller part of the specimen is in focus at higher power. The amount of light ...

What is important about this definition is that it focuses on the source of the light. Lumens provides a standard unit of measurement that directly focuses on the light output, which can be very helpful when comparing different types of light sources.

The pupil looks like a black hole. It looks black because light usually stays inside your eye. One of the few times that you might see light coming back out of your eye is in a photograph. That’s why you might see red-looking eyes in pictures taken with a flash. This is light reflecting off the blood vessels in your eyes.

Some conditions may require medication. Often, these may be in the form of eye drops or topical preparations (like ointments that you apply to your skin).

Offices, manufacturing facilities, and workrooms need significantly higher foot-candle measurements in order to make work easier and less stressful on your eyes.

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One number will not tell the whole story to provide you with the best fixture or LED light. Here at Stouch Lighting we will take into account the area, the application, and any obstructions that may block the light output to properly determine the right lighting fixture for you.