Lux (lx):
Definition: The SI unit of illumination, which is the amount of light falling on a surface per square meter. One lux is equal to one lumen per square meter.
Use: Normally used to express the intensity of light inside offices, homes, or at outdoor sites.
Phot (ph):
Description: A unit of illuminance equal to 10,000 lux. It is primarily applied in photometry to represent very high light levels.
Use Case: It is used in scientific applications like photometric measurement in laboratories and in light of high intensity.
Nox (nx):
Description: It is a rarely used unit of illuminance. It is equivalent to one thousandth of a lux (0.001 lx). It measures very low light levels.
Use Case: This unit is applicable in research where the level of light needs to be measured that is low intensity like in astronomy or dark room work.
Foot-candle (fc):
Description: A unit of illumination equal to one lumen per square foot or approximately 10.7639 lux. It measures the amount of light falling on a surface.
Use Case: Widespread usage in the United States for measuring light intensity in photography, cinematography, and horticulture.
Lumen per square meter (lm/m²):
Description: Exactly the same as lux, it is defined as the number of lumens falling per square meter, i.e. a measure of the light intensity. This metric is widely used to express illuminance as well in the SI system.
Use Case: In architectural lighting, interior design, and lighting engineering.
Lumen per square foot (lm/ft²):
Description: This is the intensity of light in terms of lumen per square foot. This is quite similar to the foot-candle.
Use Case: This also applies to similar applications as that of the foot-candles, such as in the US, for lighting design and appraisal.
Candela per square meter (cd/m²):
Description: This unit is used to measure luminance, which is the brightness of light coming from a surface, indicating the intensity per square meter in a particular direction.
Use: Used mainly for determining the level of brightness of screens, monitor, and lighting equipment.
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