Luminous Intensity Converter
Convert between various units of luminous intensity (e.g., candela, lumen/steradian, Hefner candle).
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Understanding Luminous Intensity
Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.
The SI base unit for luminous intensity is the candela (cd).
| Light Source (Approximate) | Luminous Intensity (cd) |
|---|---|
| Standard Candle (historical) | ~1 cd |
| Common LED | 0.005 – 3 cd (varies greatly) |
| 100W Incandescent Bulb (omnidirectional) | ~130 cd (total lumens ~1600, divided by 4π sr) |
| Car Headlight (high beam, focused) | Tens of thousands to >100,000 cd |