Lessa is a unit of measurement for illuminance, which refers to the amount of luminous flux per unit area. Specifically, it is defined as one lumen per square meter. The unit is primarily used in specialized contexts, though in most applications, the more commonly known unit for measuring illuminance is the lux, which is equivalent to one lumen per square meter. Illuminance is an essential factor in assessing lighting conditions, such as in workplaces, public spaces, and photography.
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