IfcLightIntensityDistribution

BACnet MVD

#### IfcLightIntensityDistribution

Natural language names

| Lichtstärkenverteilung
| Light Intensity Distribution
| Distribution de l'intensité lumineuse

##### Semantic definitions at the entity

Entity definition

IfcLightIntensityDistribution defines the the luminous intensity of a light source that changes according to the direction of the ray. It is based on some standardized light distribution curves, which are defined by the LightDistributionCurve attribute.

> New entity in IFC2x2.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | LightDistributionCurve | IfcLightDistributionCurveEnum |  | Standardized light distribution curve used to define the luminous intensity of the light in all directions. |  | X
2 | DistributionData | IfcLightDistributionData | L[1:?] | Light distribution data applied to the light source. It is defined by a list of main plane angles (B or C according to the light distribution curve chosen) that includes (for each B or C angle) a second list of secondary plane angles (the β or γ angles) and the according luminous intensity distribution measures. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcLightIntensityDistribution
1 | LightDistributionCurve | IfcLightDistributionCurveEnum |  | Standardized light distribution curve used to define the luminous intensity of the light in all directions. |  | X
2 | DistributionData | IfcLightDistributionData | L[1:?] | Light distribution data applied to the light source. It is defined by a list of main plane angles (B or C according to the light distribution curve chosen) that includes (for each B or C angle) a second list of secondary plane angles (the β or γ angles) and the according luminous intensity distribution measures. |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcLightIntensityDistribution" type="ifc:IfcLightIntensityDistribution" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcLightIntensityDistribution">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:sequence>
<xs:element name="DistributionData">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcLightDistributionData" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcLightDistributionData"/>
<xs:attribute ref="ifc:cType" fixed="list"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="LightDistributionCurve" type="ifc:IfcLightDistributionCurveEnum" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcLightIntensityDistribution;
LightDistributionCurve : IfcLightDistributionCurveEnum;
DistributionData : LIST [1:?] OF IfcLightDistributionData;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcLightDistributionDataSourceSelect

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