Candela is a unit of measurement used in photometry to express luminous intensity. There are several synonyms for candela, including candlepower, luminous flux, luminosity, and brightness. The term candlepower was used historically to refer to the amount of light produced by a single candle, but it's no longer an official measurement unit. Luminous flux is the total amount of light emitted by a source, while luminosity refers to the brightness of a source relative to human perception. Brightness can be described as a measure of light intensity and is often used interchangeably with luminosity. Understanding the synonyms for candela can help individuals better communicate about lighting and illumination.