The term "international candle" refers to a type of candle that is commonly used as a unit of measurement for luminous intensity. It is defined as a standard candle which emits a luminous intensity of one candela (cd) when measured at a specific angle and distance.
The international candle is an internationally recognized standard for comparing the brightness of different light sources. It was established to provide a consistent benchmark for measuring luminous intensity and is widely used in photometry, the science of measuring light.
To measure the luminous intensity of a light source, a photometer is typically used. The photometer is positioned at a specific distance and angle from the source being measured, and the light output is compared to that of the international candle. By comparing the two luminous intensities, a precise measurement can be obtained.
The use of the international candle as a unit of measurement ensures uniformity and accuracy in comparing and documenting the luminous intensities of various light sources. This standardized measure is particularly useful in fields such as lighting design, light source calibration, and scientific research where precise and consistent measurements are essential.
In recent years, the international candle has been substituted by the candela (cd) as the primary unit for measuring luminous intensity in the International System of Units (SI). However, the term "international candle" remains relevant in historical contexts and for understanding the development and establishment of light measurement standards.
