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If a 72 candela light source is located at a distance of 3 meters from a surface the illuminance on the surface is?
Wiki User
∙ 13y ago
a. 8 lux
b. 24 lux
c. 216 lux
d. 648 lux
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoIlluminance refers to the amount of luminous flux per unit area. If a 72 candela light source is located at a distance of 3 meters from a surface, the illuminance on the surface is 8 lux.
Wiki User
∙ 10y ago8lux
Wiki User
∙ 12y ago8 lux
Wiki User
∙ 12y agoC 216
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If a 72 candela light source is located at a distance of 3m from a surface the illuminance on the surface is?
8 lux.
If a 72-candela light source is located at a distance of 3 meters from a surface the illuminance on the surface is?
The illuminance on the surface can be calculated bu using the formula: E=I/s2. E stands for the illuminance on the surface (in lux), I stands for theintensity of the light from the source (in candelas), and s stands for the distance from the light source to the surface (in meters). So, the answer is: 8 lux
Where are short distance surface currents located?
On the surface
What is illuminance?
Illuminance is another term for luminous-flux density which defines the intensity of the luminous flux arriving at a surface, measured in lumens per square metre, which is given the special name 'lux'.
How do you calculate daylight factor in lighting design?
The most commonly used metric for measuring daylight in a building is called the "daylight factor"-expressed as a percent of available exterior daylight.Daylight factor is defined as a ratio of interior illuminance at a horizontal point in a building to the sun-shaded exterior illuminance on a horizontal surface under a fully overcast sky (a ratio of outside illuminance over inside illuminance).The higher the daylight factor, the more natural light that is available in the room.
How many candelas equals 1 lux?
They really aren't equal because they measure two different things. However, they are related to each other.The Candela is the measure of the luminous intensity of a light source. A higher Candela number means a brighter light. Lux is a measurement of light density and means lumens per square meter. Again, a greater number of lux means that the surface being illuminated by the light is is receiving more light per square meter.The formula for calculating the conversion of candelas to lux is E = I/(D*D) where E is the Illuminance of the the surface in lumens per square meter (lux), I is the Intensity of the the light source in Candelas and of course (D*D) is the square of the distance from the light source in meters.Therefore 1 Candela will illuminate a surface with 1 Lux only at one meter from a light source. At different distances it will illuminate to different densities of light.For example: Solving for E, that same one candela light source would only read 1/4 lux at two meters [ 1/(2*2)] and 1/16 lux at four meters [1/(4*4)].If you know the lux at a given distance in meters from the light source you can solve for I and it will give you the intensity of the light in Candelas. From that you can calculate the intensity of the light.For example: Solving for I, multiply the lux times the square of the distance in meters and you will have the intensity of the light source in Candelas.So a reading of 8 lux at a distance of 3 meters would mean that the light source has an intensity of 8*3*3 or 72 candelas.
What is a footcandle vs a footlambert?
A footcandle is a unit of measurement for illuminance on a surface, equal to one lumen per square foot. A footlambert, on the other hand, is a unit of luminance, measuring the brightness of a surface emitting or reflecting light in footlamberts.
What is luminosity and how is it measured in the case of the Sun?
Luminosity is the energy of all types is radiated by an object in all directions per sec. So it measured in ergs per sec or Joule per sec (= Watt). Luminosity can be measured in more than one unit. - Candela per square metre - Stilb - Apostilb - Lambert - Foot-lambert Each one is explained in the related links below. Previous answer Candela per square meter or for illuminance.
What is the difference between incandescence and luminescence?
Illuminance is another word for 'luminous-flux density', which describes the intensity of the luminous flux hitting a surface. Its SI unit of measurement is the lux, which is a special name given to a lumen per square metre. Luminance is a measure of the intensity of the light reflected by a surface. Its SI unit of measurement is the candela per square metre.
What is illuminations?
Illuminance is another term for luminous-flux density which defines the intensity of the luminous flux arriving at a surface, measured in lumens per square metre, which is given the special name 'lux'.
Where are short distance surface current?
On the surface
1 watt equal to how many lux?
Lux is unit for measuring the illumination (illuminance) of a surface. It is the amount of light received per unit of surface area. You can' t convert watt, which is power, to Lux.
