Abbreviated cd, what does a unit of measurement known as the "candela" measure?

As explained by Lumen Learning: "The candela was so named to refer to 'candlepower' back in the days when candles were the most common source of illumination... Now, with the prevalence of incandescent and fluorescent light sources, the candela is defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency."

Asked by Tom Cohen · Last updated 5 years ago · 36.7K views