Converter category
Luminous Intensity Converter
Convert between candela, carcel, hefner for luminous intensity.
Universal Luminous Intensity Converter
About luminous intensity conversions
Luminous intensity conversions are used in lighting design, photometry, and optical engineering. Our luminous intensity converter covers the SI base unit candela, plus historical units such as the carcel and hefner. Luminous intensity measures the amount of visible light emitted by a source in a particular direction. Whether you are specifying light bulbs, studying photometric standards, or comparing historical lighting units, this converter provides accurate conversions.
Most popular luminous intensity conversions
Available units
Popular luminous intensity conversions (6 total)
Unit definitions
Candela (cd)
SI base unit of luminous intensity. A candle emits about 1 cd.
Origin: Defined as the light from a sperm whale candle.
Current use: Lighting specifications, Display brightness, Photography
Carcel (carcel)
1 Carcel ≈ 9.80665 cd.
Origin: Used in 19th century France.
Current use: Historical lighting, Museum documentation
Hefner (HK)
1 Hefner (HK) ≈ 0.903 cd.
Origin: Used in Germany until mid-20th century.
Current use: Historical lighting standards, Museum research
Common uses for luminous intensity conversions
Luminous intensity conversions are used for lamp specifications, photometric testing, lighting design, and historical research.
Frequently asked questions about luminous intensity
What is the SI base unit of luminous intensity?+
The candela is the SI base unit of luminous intensity.
How is luminous intensity different from illuminance?+
Luminous intensity is the light output in a direction, measured in candelas. Illuminance is the light falling on a surface, measured in lux.
Which luminous intensity units does this converter support?+
It supports candelas, carcels, and hefners.