Defined in File Ifc4.h
IfcLightFixture: public Ifc4::IfcFlowTerminal¶
A light fixture is a container that is designed for the purpose of housing one or more lamps and optionally devices that control, restrict or vary their emission.
HISTORY New entity in IFC2x4
Type Use Definition IfcLightFixture defines the occurrence of any light fixture; common information about light fixture types is handled by IfcLightFixtureType. The IfcLightFixtureType (if present) may establish the common type name, usage (predefined type), properties, materials, ports, composition, assignments, and representations. The IfcLightFixtureType is attached using the IfcRelDefinesByType objectified relationship and is accessible by the IsTypedBy inverse attribute. If the IfcLightFixtureType has ports or aggregated elements, such objects are reflected at the IfcLightFixture occurrence using the IfcRelDefinesByObject relationship. Figure 204 illustrates light fixture type use. Figure 204 — Light fixture type use
Property Use Definition The property sets relating to this entity are defined by IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. Property sets may also be specified at the IfcLightFixtureType, defining the common property data for all occurrences of the same type. They are then accessible by the IsTypedBy inverse attribute pointing to IfcLightFixtureType.HasPropertySets. If both are given, then the properties directly defined at IfcLightFixture override the properties defined at IfcLightFixtureType. Refer to the documentation at the supertype IfcFlowTerminal and ancestors for inherited property set definitions. The following property set definitions are applicable to this entity: (All Types)
Pset_LightFixtureTypeCommon (PSET_TYPEDRIVENOVERRIDE) Pset_LightFixtureTypeThermal (PSET_TYPEDRIVENOVERRIDE)
Quantity Use Definition The quantities relating to this entity are defined by IfcElementQuantity and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. The following base quantities are defined and shall be exchanged with the IfcElementQuantity.Name = ‘BaseQuantities’. Other quantities, being subjected to local standard of measurement, may be defined with another string value assigned to Name. In this case a valid value for MethodOfMeasurement shall be provided.
Material Use Definition The material of the IfcLightFixture is defined by IfcMaterialConstituentSet or as a fallback by IfcMaterial, and attached by the RelatingMaterial attribute on the IfcRelAssociatesMaterial relationship. It is accessible by the HasAssociations inverse attribute. Material information can also be given at the IfcLightFixtureType, defining the common attribute data for all occurrences of the same type. The following keywords for IfcMaterialConstituentSet.MaterialConstituents[n].Name shall be used:
Casing: Material from which the casing is constructed.
Connection Use Definition The IfcLightFixture may be connected to other objects as follows using the indicated relationship:
IfcCovering (IfcRelConnectsElements): Indicates a suspended ceiling anchoring the light fixture. IfcOpeningElement (IfcRelFillsElements): Indicates embedding the light fixture in a building element such as a suspended ceiling.
Port Use Definition The distribution ports relating to the IfcLightFixture are defined by IfcDistributionPort and attached by the IfcRelConnectsPortToElement relationship. If the light fixture occurrence is defined by IfcLightFixtureType, then the port occurrences must reflect those defined at the IfcLightFixtureType using the IfcRelDefinesByObject relationship. Ports are specific to the IfcLightFixture PredefinedType as follows indicated by the IfcDistributionPort Name, PredefinedType, and FlowDirection:
Line (ELECTRICAL, SINK): The power supply line, typically a cable connected to a switch. Socket#1 (LIGHTING, SOURCE): A lamp socket within the light fixture. Socket#2 (LIGHTING, SOURCE): A lamp socket within the light fixture. Socket#3 (LIGHTING, SOURCE): A lamp socket within the light fixture. Socket#4 (LIGHTING, SOURCE): A lamp socket within the light fixture. Socket#5 (LIGHTING, SOURCE): A lamp socket within the light fixture. Socket#6 (LIGHTING, SOURCE): A lamp socket within the light fixture. Socket#7 (LIGHTING, SOURCE): A lamp socket within the light fixture. Socket#8 (LIGHTING, SOURCE): A lamp socket within the light fixture.
Figure 205 illustrates light fixture port use. Figure 205 — Light fixture port use
Whether the optional attribute PredefinedType is defined for this IfcLightFixture.
IfcLightFixture(std::string v1_GlobalId, ::Ifc4::IfcOwnerHistory *v2_OwnerHistory, boost::optional<std::string> v3_Name, boost::optional<std::string> v4_Description, boost::optional<std::string> v5_ObjectType, ::Ifc4::IfcObjectPlacement *v6_ObjectPlacement, ::Ifc4::IfcProductRepresentation *v7_Representation, boost::optional<std::string> v8_Tag, boost::optional<::Ifc4::IfcLightFixtureTypeEnum::Value> v9_PredefinedType)¶