The formula to calculate Millicandela (\(mcd\)) from Lumens (\(lm\)) is:

\[ mcd = \frac{1000 \times lm}{2 \pi (1 - \cos(\theta / 2))} \]

Where:

• \(mcd\) is the luminous intensity in millicandela.
• \(lm\) is the luminous flux in lumens.
• \(\theta\) is the apex angle in degrees.