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Luminous Intensity Distribution Curve(IDC)
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Luminous Intensity Distribution Curve
Luminous intensity distribution curves are typically represented in polar plots because this format allows us to visualize both the orientation and the light distribution of the light fixture. The candlepower distribution of a light fixture depends upon reflector design, shielding type, and lamp-ballast selection. It is assumed that the light fixture position is at the crossing of two axes (horizontal and vertical), and that 0° (nadir) is beneath the light fixture. Other angles, which represent the various placements of a photocell as it moves in a circular pattern around the light fixture, are marked on the graph as well.
If the distribution of light is not symmetrical in all directions around the vertical axis, such as for a 2ft. x 4ft. light fixture, candlepower values may be taken in a number of vertical planes through the light fixture (Figure A below). The planes shown in photometric reports are 0°, 22.5°, 45°, 67.5°, and 90°. The planes most commonly used in lighting practice are 0° or parallel to the lamp axes, 90° or perpendicular to the lamp axes, and at an angle 45° to the lamp axes.
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