💡 Luminous Intensity Converter 💡

Luminous intensity measures the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. The SI base unit is the candela (cd), which is defined by a fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540×10¹² Hz. This converter supports candela, millicandela (1 mcd = 0.001 cd), kilocandela (1 kcd = 1000 cd), and candlepower — an older unit where 1 candlepower approximately equals 0.981 candela (international candle). Engineers, lighting designers, and hobbyists use these units to specify LEDs, flashlights, and luminaires.

With this tool you can instantly convert any value: simply enter a number, select the source unit, choose the target unit, and the result appears immediately. The swap button conveniently flips the conversion direction and also exchanges the numerical value — so if you convert 5 cd to mcd (5000 mcd), pressing swap will set 5000 mcd as input and show the equivalent in cd. This is especially handy when comparing datasheets. The interface is fully responsive and works on mobile, tablet, and desktop. All results are rounded to six decimal places for readability, while internal calculations maintain high precision.

Luminous intensity differs from luminous flux (lumens) and illuminance (lux). Our converter focuses exclusively on intensity, which is critical for directional lighting applications such as automotive headlamps, signal lights, and optical instruments. The candela is traceable to modern photometric standards, and we've incorporated the widely accepted conversion for candlepower to ensure historical compatibility. Whether you're calibrating laboratory equipment or selecting an LED for a project, accurate conversion prevents costly errors.

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