Lumen
Enter a value and select units to convert.
Lumen Unit Table
A list of units symbol and data.
From lmTo cpAll conversion
1 lm1 cp
2 lm2 cp
3 lm3 cp
4 lm4 cp
5 lm5 cp
6 lm6 cp
7 lm7 cp
8 lm8 cp
9 lm9 cp
10 lm10 cp
Description

Lumen (lm): Measuring Luminous Flux

The lumen is the SI unit of luminous flux, quantifying the total amount of visible light emitted by a source per unit of time. One lumen is defined as the luminous flux emitted within a unit solid angle (one steradian) by a point source with a uniform luminous intensity of one candela. This unit is crucial for evaluating the overall brightness of light sources, such as bulbs and LEDs.

In practical terms, lumens provide a direct measure of a light source's output, enabling consumers and professionals to assess and compare the brightness of different lighting products. Higher lumen values indicate greater light output, which is essential for applications requiring specific illumination levels, from residential lighting to commercial and industrial settings.

Candlepower (cp): Traditional Measure of Luminous Intensity

Candlepower is an older unit of luminous intensity, historically defined as the light emitted by a standard candle. While it has been largely replaced by the candela in the International System of Units, candlepower is still used colloquially to describe the brightness of flashlights, spotlights, and other directional light sources. One candlepower is approximately equal to one candela.

Despite its obsolescence in scientific contexts, understanding candlepower remains useful for interpreting product specifications and consumer information, especially in industries where traditional units persist. Recognizing the equivalence between candlepower and candela facilitates accurate comparisons and informed decisions when selecting lighting equipment.

Complete list of conversion for Lumen
Lumen (lm)

1 Lumen = 1 Candela

Convert 2 lmcd

1 Lumen = 1 Candlepower

Convert 2 lmcp

1 Lumen = 1 Lux

Convert 2 lmlx

1 Lumen = 0.09290312990644656 Footcandle

Convert 2 lmfc

1 Lumen = 0.0001 Phot

Convert 2 lmph

1 Lumen = 1 Candela per square meter

Convert 2 lmcd/m²

1 Lumen = 1 Nit

Convert 2 lmnt

1 Lumen = 0.0001 Stilb

Convert 2 lmsb

1 Lumen = 0.0003141592653587727 Lambert

Convert 2 lmL

1 Lumen = 0.2918635079290997 Footlambert

Convert 2 lmfL

1 Lumen = 1 Lumen second

Convert 2 lmlm·s

1 Lumen = 1 Lux second

Convert 2 lmlx·s

1 Lumen = 1 Rayleigh

Convert 2 lmR