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ldc2phi

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

\Phi_v = \int{I_v \,\textrm{d}}\Omega_1

Usage:

phi = ldc2phi(ldc)

Where:

ParameterDescription
phiIs the luminous flux of the luminaire, \Phi_v.
ldcIs 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:

Roland Baer, Meike Barfuß, Dirk Seifert: Beleuchtungstechnik Grundlagen. 4. Auflage, Huss-Medien GmbH, am Friedrichshain 22, 10407 Berlin, 2016, ISBN: 978-3-341-016343.

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