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If you continue to have problems, please let us know by contacting Kahoot! SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area. Illuminance is a measure of how much luminous flux is spread over a given area. A flux of 1000 lumens, concentrated into an area of 1 square metre, lights up that square metre with an illuminance of 1000 lux. However, the same 1000 lumens, spread out over 10 square metres, produces a dimmer illuminance of only 100 lux. To light a factory floor with dozens of times the area of the kitchen would require dozens of such fixtures. Thus, lighting a larger area to the same level of lux requires a greater number of lumens.
Sunrise or sunset on a clear day. The illuminance provided by a light source on a surface perpendicular to the direction to the source is a measure of the strength of that source as perceived from that location. For instance, a star of apparent magnitude 0 provides 2. 08 microlux at the Earth’s surface. The illuminance on a surface depends on how the surface is tilted with respect to the source.
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The lux is also a measure of luminous emittance, the number of lumens given off by a surface per square metre, regardless of how that light is distributed in terms of the directions in which it is emitted. Like all photometric units, the lux has a corresponding “radiometric” unit. For monochromatic light of this wavelength, the amount of illuminance for a given amount of irradiance is maximum: 683. 1 lux at this wavelength is about 1.
For a light source with mixed wavelengths, the number of lumens per watt can be calculated by means of the luminosity function. In order to appear reasonably “white”, a light source cannot consist solely of the green light to which the eye’s image-forming visual photoreceptors are most sensitive, but must include a generous mixture of red and blue wavelengths, to which they are much less sensitive. The ratio between the actual number of lumens per watt and the theoretical maximum is expressed as a percentage known as the luminous efficiency. In reality, individual eyes vary slightly in their luminosity functions. However, photometric units are precisely defined and precisely measurable. They are based on an agreed-upon standard luminosity function based on measurements of the spectral characteristics of image-forming visual photoreception in many individual human eyes.
Specifications for video cameras such as camcorders and surveillance cameras often include a minimal illuminance level in lux at which the camera will record a satisfactory image. The corresponding unit in English and American traditional units is the foot-candle. One foot candle is about 10. Since one foot-candle is the illuminance cast on a surface by a one-candela source one foot away, a lux could be thought of as a “metre-candle”, although this term is discouraged because it does not conform to SI standards for unit names. In astronomy, apparent magnitude is a measure of the illuminance of a star on the Earth’s atmosphere. A star with apparent magnitude 0 is 2.
It is a legacy code to accommodate old code pages in some Asian languages. Use of this code is not recommended. The lumen second is sometimes called the talbot. Luminous flux per unit solid angle per unit projected source area. The candela per square metre is sometimes called the nit.