Luminous intensity unit is a term used in physics to describe the amount of luminous flux emitted from a light source. Synonyms for this term include candelas, candlepower, and luminous intensity. These terms are often used interchangeably to describe the brightness of a light source. Candelas is the standard unit of luminous intensity, and is commonly abbreviated as 'cd'. It is defined as the amount of light emitted in a specific direction by a single candle. Candlepower, on the other hand, is a term that has been largely replaced by candelas, but is still used in certain contexts. Luminous intensity is the general term used to describe the brightness of a light source in relation to its size and direction.