The following is an infographic that sets out a number of guidelines to determine the amount of lumens you need to light the various rooms of your house:

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How do you ascertain the illumination level needed for various applications to achieve optimal light and safety as well as visual comfort? We often buy our light bulbs according to their watt consumption without knowing the amount of light they project. How do we measure light? In the lighting industry, we often speak of foot-candles, lumens, and lux. The following are basic references that will help you measure light.

Picture a candle set in the middle of a sphere measuring 0.60 meters (2 feet) in diameter. If we cut a hole that measures 0.09 square meters (1 square foot) in the centre of this sphere, the light that shines through is what we define as a lumen.

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In reality, lumens are quite difficult to measure: laboratory tests are usually required. Consequently, if you want to know the number of lumens projected by your lamp or fixture with integrated bulb, you may want to refer to the product packaging or consult the luminaire catalogue.

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When comparing the output of a HID light source to that of a LED light source, we dissect and explain the various measurements calculated in lumens.

A higher number of lumens are indicative of a brighter, more intense light, whereas a lower number of lumens represent dimmer, more subdued lighting.

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The lumen is a significant entity: it measures the total amount of visible light emitted by a given source. All other measurements are based on the lumen.The lumen measurement originated from the basic concept of foot-candles. It might be illustrated, more or less, by the image shown here. A more scientific definition exists today, but this drawing helps visualize the lumen.

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At that time, the candle-making industry provided a consistent, steady, clean, and efficient way to measure light. Thus, we use this well-known expression, even to this day.

Here is a simple illustration that will help you understand the foot-candle measurement. Imagine setting a candle at a distance of 0.30 meters (1 foot) from a flat wall on which we’ve drawn a square shape measuring 0.09 square meters (1 square foot). One lumen per square foot will illuminate this surface.

It does make any sense to evaluate the amount of light according to the watt consumption of the lamp. When you want to replace a light bulb, follow this simple rule of thumb to convert watts to lumens, and vice versa.

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Variances in light dispersion or brightness might be caused by a reduction of light known as optical loss. Read on to learn what it is and how to prevent it.

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Lighting is a more complex process than we can imagine. Following are a few principles of lighting technology which will facilitate the installation of light systems that produce optimal visual acuity and create a pleasant atmosphere.

Bright, diffused, largely shadowless light is usually the best method of lighting for about 70-85% of all video production applications.

A 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 10.57 lux.

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Foot-candle is the most widespread lighting measurement in the industry. Why do we still use the word “candle” to measure light in this day and age? The explanation for this choice dates back to the origins of the candle itself. When people began to measure the intensity of light, candles were the most common light source available.

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Ordinarily, we establish the optimal lighting requirements based on the need for appropriate foot-candles. How can you determine the best amount of lighting for your particular application? The Illuminating Engineering Society of North America (IES) has set a number of guidelines that you may wish to consult.