The term "candlepower unit" is an outdated measurement used to quantify the brightness of a light bulb. With the emergence of various new lighting technologies, this unit has been replaced by the term "lumen", which is a more accurate measure of the amount of visible light emitted by a source. Other synonyms for candlepower unit include foot-candle, which is a measure of illuminance, and lux, which is a unit of luminous flux density. Additionally, wattage and Kelvin temperature are also used to describe the brightness and color of a light source. As the world of lighting continues to evolve, it's important to stay up-to-date on the latest terminology and technology.