writeldt

The writeldt function saves a given luminous distribution curve as EULUMDAT file.

Note: EULUMDAT files are usually normalized at 1000 lm luminous flux, the luminous intensity should therefore be given in cd/klm.

I_{\textrm{norm}}\left(\gamma\right) = I\left(\gamma\right)\cdot \frac{1000}{\Phi_{\textrm{luminaire}}}

See also: readldt, ldc2Phi

Usage:

writeldt(file,ldt,'normalize')

Where:

Parameter	Description
file	Specifies path and filename.
ldt	Is the ldt struct containing the EULUMDAT file information: ldt.name  – gives the luminiare name information ldt.header – contains the file header information ldt.anglesC – contains the C angles ldt.anglesG – contains the angles ldt.I – contains the corresponding luminous intensities
'normalize' (optional)	Will perform the normalization to cd/klm before saving the EULUMDAT file.

Examples

Read, adjust, save and plot a ldt file:

% Import Lambert ldt
ldt = readldt('lambert.ldt');
% Adjust luminous intensity distribution
ldt.I = ldt.I.*cosd(ldt.anglesG);
ldt.name = 'luminaire';

% Save in new .ldt file
writeldt('newldt.ldt',ldt,'normalize')

% read new .ldt file and plot luminous intensity distribution
newldt = readldt('newldt.ldt');
plot2dldc(newldt)

See also: readldt, plot3dldc

Result:

References