The **ldc2Phi** function calculates the luminous flux \Phi_v of a luminaire from its luminous intensity distribution curve (LDC) with the following equation:

Usage:

phi = ldc2phi(ldc)

Where:

Parameter | Description |

`phi` | Is the luminous flux of the luminaire, \Phi_v. |

`ldc` | Is the luminous distribution curve of the luminaire, see also: readldt |

**Example**

ldc = readldt('lambert.ldt'); phi = ldc2phi(ldc)

See also: readldt

Result:

phi = 1000.00

Note: EULUMDAT .ldt files are usually normalized at 1000 lm.

**Reference:**

`Beleuchtungstechnik Grundlagen. 4. Auflage, Huss-Medien GmbH, am Friedrichshain 22, 10407 Berlin, 2016, ISBN: 978-3-341-016343.`