IFC 4.3.0.1 (IFC4X3) development

7.4.4.38 Pset_LampTypeCommon

7.4.4.38.1 Semantic definition

A lamp is a component within a light fixture that is designed to emit light.

History: Name changed from Pset_LampEmitterTypeCommon in IFC 2x3.

7.4.4.38.2 Applicable entities

7.4.4.38.3 Properties

Name Property Type Data Type Description
Reference IfcPropertySingleValue IfcIdentifier

Reference ID for this specified type in this project (e.g. type 'A-1'), Also referred to as "construction type". It should be provided as an alternative to the name of the "object type", if the software does not support object types and no classification reference to a recognized classification system used.

Status IfcPropertyEnumeratedValue PEnum_ElementStatus

Status of the element, predominately used in renovation or retrofitting projects. The status can be assigned to as "New" - element designed as new addition, "Existing" - element exists and remains, "Demolish" - element existed but is to be demolished, "Temporary" - element will exists only temporary (like a temporary support structure).

ContributedLuminousFlux IfcPropertySingleValue IfcLuminousFluxMeasure

Luminous flux is a photometric measure of radiant flux, i.e. the volume of light emitted from a light source. Luminous flux is measured either for the interior as a whole or for a part of the interior (partial luminous flux for a solid angle). All other photometric parameters are derivatives of luminous flux. Luminous flux is measured in lumens (lm). The luminous flux is given as a nominal value for each lamp.

LightEmitterNominalPower IfcPropertySingleValue IfcPowerMeasure

Light emitter nominal power.

LampMaintenanceFactor IfcPropertySingleValue IfcReal

Non recoverable losses of luminous flux of a lamp due to lamp depreciation; i.e. the decreasing of light output of a luminaire due to aging and dirt.

LampBallastType IfcPropertyEnumeratedValue PEnum_LampBallastType

The type of ballast used to stabilise gas discharge by limiting the current during operation and to deliver the necessary striking voltage for starting. Ballasts are needed to operate Discharge Lamps such as Fluorescent, Compact Fluorescent, High-pressure Mercury, Metal Halide and High-pressure Sodium Lamps. Magnetic ballasts are chokes which limit the current passing through a lamp connected in series on the principle of self-induction. The resultant current and power are decisive for the efficient operation of the lamp. A specially designed ballast is required for every type of lamp to comply with lamp rating in terms of Luminous Flux, Color Appearance and service life. The two types of magnetic ballasts for fluorescent lamps are KVG Conventional (EC-A series) and VVG Low-loss ballasts (EC-B series). Low-loss ballasts have a higher efficiency, which means reduced ballast losses and a lower thermal load. Electronic ballasts are used to run fluorescent lamps at high frequencies (approx. 35 - 40 kHz).

LampCompensationType IfcPropertyEnumeratedValue PEnum_LampCompensationType

Identifies the form of compensation used for power factor correction and radio suppression.

ColourAppearance IfcPropertySingleValue IfcLabel

In both the DIN and CIE standards, artificial light sources are classified in terms of their colour appearance. To the human eye they all appear to be white; the difference can only be detected by direct comparison. Visual performance is not directly affected by differences in colour appearance.

Spectrum IfcPropertyTableValue IfcNumericMeasure/IfcNumericMeasure

The spectrum of radiation describes its composition with regard to wavelength. Light, for example, as the portion of electromagnetic radiation that is visible to the human eye, is radiation with wavelengths in the range of approx. 380 to 780 nm (1 nm = 10 m). The corresponding range of colours varies from violet to indigo, blue, green, yellow, orange, and red. These colours form a continuous spectrum, in which the various spectral sectors merge into each other.

ColourTemperature IfcPropertySingleValue IfcThermodynamicTemperatureMeasure

The colour temperature of any source of radiation is defined as the temperature (in Kelvin) of a black-body or Planckian radiator whose radiation has the same chromaticity as the source of radiation. Often the values are only approximate colour temperatures as the black-body radiator cannot emit radiation of every chromaticity value. The colour temperatures of the commonest artificial light sources range from less than 3000K (warm white) to 4000K (intermediate) and over 5000K (daylight).

ColourRenderingIndex IfcPropertySingleValue IfcInteger

The CRI indicates how well a light source renders eight standard colours compared to perfect reference lamp with the same colour temperature. The CRI scale ranges from 1 to 100, with 100 representing perfect rendering properties.

Table 7.4.4.38.A

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7.4.4.38.4 Changelog

  • applicability, IfcLampType
  • property, ColourAppearance
  • property, ColourRenderingIndex
  • property, ColourTemperature
  • property, ColorAppearance
  • property, ColorRenderingIndex
  • property, ColorTemperature