The normldc function normalizes a given luminous intensity distribution struct to cd/klm.

See also: readldt, writeldt


ldc = normldc(ldc)


ldcIs the ldt struct containing EULUMDAT file information:  – 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

Read, adjust, normalize and plot a ldt file:

% Import Lambert ldt
ldc = readldt('lambert.ldt');
% Manipulate luminous intensity distribution
ldc.I = ldc.I.*cosd(ldc.anglesG); = 'luminaire';
% Normalize luminous intensity again
norm_ldc = normldc(ldc);

% Plot normalized ldc

See also: readldt, plot2dldc



Ian Ashdown: Thinking Photometrically Part II. 2011, (LIGHTFAIR 2001 Pre-Conference Workshop).

Axel Werner Richard Stockmar: EULUMDAT – ein Leuchtendatenformat für den europäischen Beleuchtungplaner. In: 9. Gemeinschaftstagung der Lichttechnischen Gesellschaften Deutschlands, der Niederlande, Österreichs und Schweiz, pp. 641–644, Nederlandse Stichting voor Verlichtingskunde, 1990.

2 thoughts on “normldc”

  1. Hello Rudawski,
    thank you so much for your contribution of this Toolbox.
    i used this function (Normldc)in matlab, i copy your code in matlab
    % Import Lambert ldt
    ldc = readldt(‘lambert.ldt’);
    % Adjust luminous intensity distribution
    ldc.I = ldc.I.*cosd(ldt.anglesG); = ‘luminaire’;
    % Normalize luminous intensity
    norm_ldc = nomldc(ldc);

    % Plot normalized ldc

    but it shows “nable to resolve the name ‘ldt.anglesG’.”


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