lux
/lʌks/
Definition
Noun: - A unit of illumination: A lux is a standard unit of measurement for illuminance, which is the amount of luminous flux (light) falling on a surface. It is defined as one lumen per square meter. It is used in physics and engineering to quantify lighting levels.
Usage
- The lux is the SI (International System of Units) unit for illuminance.
- It is used to measure how brightly a surface is illuminated, such as in photography, workplace safety standards, architecture, and plant growth studies.
- Example:
Advanced Usage
- "Lux level": A common phrase referring to the measured illuminance in a specific area.
- The factory floor must maintain a minimum lux level of 300 for safe operation.
- Scientific comparisons often involve converting between lux and other units like foot-candles (1 lux ≈ 0.0929 foot-candles).
Variants and Related Words
- Illuminance (n): The quantity that the lux measures; the total luminous flux incident on a surface per unit area.
- Lumen (n): The SI unit of luminous flux, which is a measure of the total quantity of visible light emitted by a source. A lux is one lumen per square meter.
- Foot-candle (n): A non-metric unit of illuminance. One foot-candle is approximately 10.76 lux.
Synonyms
- Illuminance unit: A more general term for units measuring light on a surface.
- (Note: There are no direct synonyms for "lux" as a specific unit, but it is a type of .)
Related Phrases
- "Lux meter": A device used to measure illuminance in lux.
- The technician used a lux meter to check the lighting in the classroom.
Notes
- The word "lux" is singular; the standard plural form is lux (e.g., 10 lux, 100 lux). The form "luxes" is rarely used in technical contexts.
- It is derived from the Latin word for "light."
Noun
-
a unit of illumination equal to 1 lumen per square meter; 0.0929 foot candle
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