IfcLightDistributionCurveEnum

Natural language names
Light Distribution Curve Enum
Enumération des courbes de distribution lumineuse
Semantic definitions at the type
Type definition

There are three kinds of light distribution curves, see Figure 400.

NOTE  The classification as type A, B, C is according to Standard CEN TC 169, prEN 13032-1, CIE 121:

B-Type C-Type
B-Type System C-Type System

Figure 400 — Light distribution curves

> HISTORY  New enumeration in IFC2x2.
Enumeration definition
ConstantDescription
TYPE_AType A is basically not used. For completeness the Type A Photometry equals the Type B rotated 90° around the Z-Axis counter clockwise.
TYPE_BType B is sometimes used for floodlights. The B-Plane System has a horizontal axis. B-Angles are valid from -180° to +180° with B 0° at the bottom and B180°/B-180° at the top, β-Angles are valid from -90° to +90°.
TYPE_CType C is the recommended standard system. The C-Plane system equals a globe with a vertical axis. C-Angles are valid from 0° to 360°, γ-Angles are valid from 0° (south pole) to 180° (north pole).
NOTDEFINED
Formal representations
XML Specification
 <xs:simpleType name="IfcLightDistributionCurveEnum">
  <xs:restriction base="xs:string">
   <xs:enumeration value="type_a"/>
   <xs:enumeration value="type_b"/>
   <xs:enumeration value="type_c"/>
   <xs:enumeration value="notdefined"/>
  </xs:restriction>
 </xs:simpleType>
EXPRESS Specification
TYPE IfcLightDistributionCurveEnum = ENUMERATION OF (
 TYPE_A,
 TYPE_B,
 TYPE_C,
 NOTDEFINED);
END_TYPE;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcLightIntensityDistribution

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