Lux

Lux is primarily known as the SI unit of illuminance. It measures the perceived brightness of light falling on a surface and is defined as one lumen per square meter. The symbol for the unit is lx. Lux is used in a variety of contexts, including lighting design, photography, cinematography, workplace safety, and architectural planning, to indicate how well a space is lit for human vision.

Etymology and usage: The term lux comes from the Latin word for light. In science and engineering, it provides a standardized way to express how much light reaches a given area, helping professionals compare lighting conditions across different environments and tasks.

Other uses: Lux is also employed as a personal name or nickname and as a brand name. It is notably used by a long-established brand of soap and personal-care products marketed by Unilever in many countries. As a name, Lux appears in various fictional and non-fictional contexts, where it may function as a given name or alias.

In summary, Lux denotes a measurable unit of light exposure on surfaces, rooted in Latin, and also serves as a versatile label in branding and naming beyond its scientific meaning.