Footcandle (fc) and lux (lx) are both units of illuminance, which measures the amount of light falling on a surface. Footcandle is commonly used in the United States, while lux is the SI unit used internationally.

The formula for converting footcandles to lux is:

\[1 \text{ fc} = 10.764 \text{ lux}\]Or more generally:

\[\text{Lux} = \text{Footcandles} \times 10.764\]- Identify the illuminance value in footcandles.
- Multiply the footcandle value by 10.764.
- The result is the illuminance in lux.

Let's convert 50 footcandles to lux:

- Illuminance in footcandles = 50 fc
- \[\begin{align} \text{Lux} &= 50 \times 10.764 \\ &= 538.2 \text{ lux} \end{align}\]

This diagram illustrates the equivalence between 50 footcandles (left, yellow) and 538.2 lux (right, cyan). The equal heights of the bars represent that these are equivalent measures of illuminance in different units.

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