# Lux to candela calculator

Convert illuminance from lux (lx) to luminous intensity in candelas (cd) effortlessly. Perfect for lighting design, photometry, and light measurement calculations. Obtain accurate candela measurements by converting lux using this convenient online tool.

## What is Lux to candela

Lux (lx) and candela (cd) are different units of measurement used in lighting. Lux measures illuminance, which is the amount of light that falls on a surface. Candela, on the other hand, measures luminous intensity, which is the amount of light emitted by a light source in a particular direction.

The relationship between lux and candela depends on the distance between the light source and the surface being illuminated. The formula for converting lux to candela is:

Candela (cd) = Lux (lx) x (Distance in meters)^2

To convert lux to candela, you multiply the lux value by the square of the distance between the light source and the surface.

Please note that this conversion assumes that the light is evenly distributed over the surface being measured and that the distance is measured in meters. If the light source does not emit light uniformly in all directions or if the surface is not perpendicular to the light source, the result may vary.

It's important to consider the specific characteristics of the lighting setup and the geometry of the situation to ensure an accurate conversion from lux to candela.

## Lux to candela calculation

### Lux to candela calculation with distance in feet

The luminous intensity *I*_{v} in candela (cd) is equal
to 0.09290304* *times the illuminance *E*_{v} in
lux (lx),

times the square distance from the light source *d*^{2}
in square feet (ft^{2}):

*I*_{v(cd)} =
0.09290304* *×*
E*_{v(lx)} × (*d*_{(ft)})^{2}

_{So}

candela = 0.09290304* *×*
*lux × square feet

_{Or}

cd = 0.09290304* *×*
*lx × ft^{2}

### Lux to candela calculation with distance in meters

The luminous intensity *I*_{v} in candela (cd) is equal
to the illuminance *E*_{v} in
lux (lx),

times the square distance from the light source *d*^{2} in
square meters (m^{2}):

*I*_{v(cd)} =
*E*_{v(lx)} × (*d*_{(m)})^{2}

_{So}

candela = lux × square meters

_{Or}

cd = lx × m^{2}

## Lux to candela example

To convert Lux (lx) to Candela (cd), you need to consider the distance from the light source and the solid angle over which the light is emitted. Here's an example that demonstrates the conversion using a calculator:

Assuming you have a light source with different illuminance values in Lux (lx) and you want to estimate the equivalent luminous intensity in Candela (cd) at a specific distance, you can follow these steps:

Step 1: Determine the solid angle over which the light is emitted. This can be specified by the viewing angle of the light source.

Step 2: Measure the illuminance in Lux (lx) at a specific distance from the light source.

Step 3: Calculate the luminous intensity in Candela (cd) using the formula:

Luminous Intensity (cd) = Illuminance (lx) × Distance^2 (m^2) / Solid Angle (steradians)

Let's suppose the solid angle is 2π steradians (which corresponds to light emitting evenly in all directions) and you have the following illuminance values at a distance of 2 meters:

Illuminance (lx) | Luminous Intensity (cd) |
---|---|

500 | 1250 |

1000 | 2500 |

2000 | 5000 |

For example, if the illuminance is 500 lx, the luminous intensity would be (500 lx) × (2^2 m^2) / (2π steradians) = 1250 cd.

Similarly, for an illuminance of 1000 lx, the luminous intensity would be (1000 lx) × (2^2 m^2) / (2π steradians) = 2500 cd.

You can follow the same calculation for other illuminance values.

Please note that the actual luminous intensity may vary depending on the specific characteristics of the light source and the angle over which it emits light. Additionally, this calculation assumes an idealized point light source emitting light uniformly in all directions.