IfcLightDistributionData

BACnet MVD

#### IfcLightDistributionData

Natural language names

| Daten der Lichtverteilung
| Light Distribution Data
| Donnée de distribution lumineuse

##### Semantic definitions at the entity

Entity definition

IfcLightDistributionData defines the luminous intensity of a light source given at a particular main plane angle. It is based on some standardized light distribution curves; the MainPlaneAngle is either the

- A angle; if the IfcLightDistributionCurveEnum is set to TYPE_A
- B angle; if the IfcLightDistributionCurveEnum is set to TYPE_B
- C angle; if the IfcLightDistributionCurveEnum is set to TYPE_C

For each MainPlaneAngle (considered as being the row of a table) a list of SecondaryPlaneAngle's are given (considered to be the columns of a table). They are either the:

- α angle; if the IfcLightDistributionCurveEnum is set to TYPE_A
- β angle; if the IfcLightDistributionCurveEnum is set to TYPE_B
- γ angle; if the IfcLightDistributionCurveEnum is set to TYPE_C

For each pair of MainPlaneAngle and SecondaryPlaneAngle the LuminousIntensity is provided (the unit is given by the IfcUnitAssignment referring to the LuminousIntensityDistributionUnit, normally cd/klm).

> HISTORY New entity in IFC2x2.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | MainPlaneAngle | IfcPlaneAngleMeasure |  | The main plane angle (A, B or C angles, according to the light distribution curve chosen). |  | X

2

SecondaryPlaneAngle

IfcPlaneAngleMeasure

L[1:?]

The list of secondary plane angles (the α, β or γ angles) according to the light distribution curve chosen.

> NOTE The SecondaryPlaneAngle and LuminousIntensity lists are corresponding lists.

X

3 | LuminousIntensity | IfcLuminousIntensityDistributionMeasure | L[1:?] | The luminous intensity distribution measure for this pair of main and secondary plane angles according to the light distribution curve chosen. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcLightDistributionData
1 | MainPlaneAngle | IfcPlaneAngleMeasure |  | The main plane angle (A, B or C angles, according to the light distribution curve chosen). |  | X

2

SecondaryPlaneAngle

IfcPlaneAngleMeasure

L[1:?]

The list of secondary plane angles (the α, β or γ angles) according to the light distribution curve chosen.

> NOTE The SecondaryPlaneAngle and LuminousIntensity lists are corresponding lists.

X

3 | LuminousIntensity | IfcLuminousIntensityDistributionMeasure | L[1:?] | The luminous intensity distribution measure for this pair of main and secondary plane angles according to the light distribution curve chosen. |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcLightDistributionData" type="ifc:IfcLightDistributionData" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcLightDistributionData">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:attribute name="MainPlaneAngle" type="ifc:IfcPlaneAngleMeasure" use="optional"/>
<xs:attribute name="SecondaryPlaneAngle" use="optional">
<xs:simpleType>
<xs:restriction>
<xs:simpleType>
<xs:list itemType="ifc:IfcPlaneAngleMeasure"/>
</xs:simpleType>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="LuminousIntensity" use="optional">
<xs:simpleType>
<xs:restriction>
<xs:simpleType>
<xs:list itemType="ifc:IfcLuminousIntensityDistributionMeasure"/>
</xs:simpleType>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcLightDistributionData;
MainPlaneAngle : IfcPlaneAngleMeasure;
SecondaryPlaneAngle : LIST [1:?] OF IfcPlaneAngleMeasure;
LuminousIntensity : LIST [1:?] OF IfcLuminousIntensityDistributionMeasure;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcLightIntensityDistribution

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