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Open the tool, enter or paste your input, and your result appears instantly. Use the copy button to save it. The whole process takes under a minute.

Luminous intensity Converter

Convert luminous intensity units like candela.

Convert Units

From:

To:

Result:

Convert luminous intensity measurements in candela and other units.

What is Luminous Intensity Converter?

Luminous intensity measures the power of a light source in a specific direction, weighted by the human eye's sensitivity to wavelength. It is one of the seven SI base units. A candle flame emits approximately 1 candela, hence the unit name.

Understanding the Units

Candela (cd)

The SI base unit of luminous intensity. Defined by the luminous efficacy of monochromatic radiation at 540 THz.

Common Uses: All modern lighting specifications, LED brightness ratings, headlight standards

Candlepower (cp)

An older unit of luminous intensity, approximately equal to one candela. Now largely replaced by the candela.

Common Uses: Historical lighting documentation, some flashlight ratings

Conversion: 1 cp ≈ 0.981 cd

Common Conversions

Candle flame: ~1 cd
LED indicator: 5–50 mcd (millicandela)
Car low-beam headlight: 700–1,200 cd
Street lamp: 3,000–5,000 cd
Lighthouse: up to 800,000 cd

Conversion Formulas

Luminous flux = Intensity × Solid angle (Φ = I × Ω)
Illuminance = Intensity ÷ Distance² (E = I/d²) — inverse square law
Candela to candlepower: cp = cd × 1.0197
Candlepower to candela: cd = cp × 0.981

Practical Examples

Standard candle provides ~1 cd — origin of the candela unit

Bicycle headlight: 100–1,000 cd for safe road illumination

Search-and-rescue spotlight: 100,000–500,000 cd

At 1 m distance, a 1 cd source produces 1 lux of illuminance

When to Use Each Unit

Candela (cd): All modern lighting design and product specifications

Candlepower (cp): Historical data and older flashlight/spotlight product listings

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