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What is the strength of light falling on a certain area called?
What is the strength of area falling on a certain area
How do you measure the amount of light under a tree?
To measure the amount of light under a tree, you can use a light meter, which quantifies the illuminance in lux or foot-candles. Position the meter at the height of the plants or ground level beneath the tree's canopy, taking multiple readings at different times of the day to account for variations in sunlight. Additionally, you can use a smartphone app designed for measuring light levels as a more accessible option. Recording the readings over time will provide a clearer picture of the light conditions under the tree.
Who invented the foot candle?
The foot candle, a unit of illuminance, was developed by the American physicist and inventor, William Thompson, who is also known as Lord Kelvin. The term "foot candle" refers to the amount of light produced by a candle at a distance of one foot. While Thompson contributed to the understanding of light measurements, the concept of the foot candle became widely used in lighting design and engineering.
What quantity of lux or foot-candles in a cave passage is considered total darkness for example .0001 or .001 or .01 or .1 etc or do you need to consider spectral response or some other factor?
Total darkness is typically defined as less than 0.005 lux, as this is the lowest level of light where the human eye can detect any presence of light. The spectral response of light may be a factor to consider for more precise measurements, but for general purposes, the lux value is sufficient.
Where is Rigel located?
rigel is the right foot of the constellation orion
Are lumens and foot candles the same?
No, lumens and foot candles are not the same. Lumens measure the total amount of light output from a source, while foot candles measure the illuminance or light intensity on a surface. Lumens are used to describe the brightness of a light source, whereas foot candles are used to describe the light level at a specific point.
What is unit of illumination?
Light intensities are usually measured in candle power. What that means is the equivalent of the light of one candle, measured at a distance of one foot, sometimes called, `foot candles' or `candellas'. +++ In the SI system the flux or "amount" of light, is measured in lumen; and the illuminence or brightness of the light, on a surface in lumens per square metre, a compound unit called the lux.
What unit measures light intensity?
in foot-candles. i.e. the brightness of a candle one foot away
What is the equivalence of 20 foot candles in watts?
There is no direct equivalence between foot candles and watts as they measure different aspects of light. Foot candles measure illuminance (light intensity on a surface), while watts measure power consumption. The relationship between the two depends on various factors like the efficiency of the light source and the distance from the source to the surface.
If you have 20 foot-candles of light then you replace light and have 200FC does that mean you have a 100 percent increase in light output?
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What is the conversion factor from foot-lamberts to foot-candles?
The conversion factor from foot-lamberts to foot-candles is 3.426.
How many foot candles are suggested for a retail store?
It depends on the atmosphere of the store. For example, Best buy uses automated lighting with dimmable ballasts to maintain a light level of 55 foot candles.
What are the uses of a foot candle?
The footcandle is a measure of the amount of light in a space. For classrooms the amount of light at desk height should be about 50 footcandles. Parking garages reguire about 5 foot candles. 1 footcandle is good for street lighting. A unit of measure of the intensity of light falling on a surface, equal to one lumen per square foot and originally defined with reference to a standardized candle burning at one foot from a given surface.
What size light do you use in a 14.8 X 14.8 room?
It depends on what the room is used for. There are specific tables that designate how many foot candles are needed depending on what the room is to be used for. Without stating what the rooms use is, the question can not be answered.
What is the standard foot candle requirement for church lighting?
The light levels in any church depends on many things but for comfortable reading, I would have at least 30 foot candles.
How to calculate light intensity in a given environment?
To calculate light intensity in a given environment, you can use a light meter to measure the illuminance in lux or foot-candles. This device measures the amount of light reaching a surface. The formula to calculate light intensity is: Light Intensity Illuminance x Distance2 Where: Illuminance is the amount of light falling on a surface in lux or foot-candles Distance is the distance between the light source and the surface By using this formula, you can determine the light intensity in a specific environment.
What would you use to measure light intensity?
A light meter is typically used to measure light intensity. These devices capture the amount of light in a particular area and provide a quantitative measurement in units such as lux or foot-candles.
