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IEC/TS 62504-2011 pdf free

IEC/TS 62504-2011 pdf free.General lighting – LEDs and LED modules – Terms and definitions.
This Technical Specification presents terms and definitions relevant for lighting with LED light sources. It provides both descriptive terms (such as ‘built-in LED module”) and measurable terms (such as “luminance”).
NOTE Annex A gives an overview of systems composed of LED modules and control gear.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
lEG 60050-845:1987, International Electrotechnical Vocabulary — Chapter 845: Lighting lEG 60061-1, Lamp caps and holders together with gauges for the control of
interchangeability and safety — Part 1: Lamp caps
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-845 and the following apply.
3.1 ambient temperature tamb average temperature of air or another medium in the vicinity of the LED or LED module NOTE 1 During the measurement 01 the ambient temperature, the measuring instrumentiprobe should be shielded from draughts and radiant heating, (lEG 60050-826:2004. definition 826-1 0-03, modified] (see also CIE 127, Subclause 2.2.5)
NOTE 2 Ambient temperature is expressed in Celsius degrees.
3.2 angular subtense a angle subtended by an apparent source as viewed from a point in space
3.3 apparent source for a given evaluation location of the retinal hazard, the real or virtual object that forms the smallest possible retinal image (considering the accommodation range of the human eye)
NOTE I The accommodation range of the eye is assumed to be variable from 100 mm to infinity, The location of the apparent source for a given viewing position in the beam is that location to which the eye accommodates to produce the most hazardous retinal irradiance condition.
NOTE 2 This definition is used to determine, for a given evaluation position, the location of the apparent origin of laser radiation in the wavelength range of 380 nm to 1 400 nm. In the limit of vanishing divergence. i.e. in the case of a well collimated beam, the location of the apparent source goes to infinity.
(IEC 60825-1:2007, 3.10, modified)
3.4 beam angle angle between two imaginary lines in a plane through the optical beam axis, such that these lines pass through the centre of the front face of the lamp and through points at which the luminous intensity is 50 % of the centre beam intensity
(IEC/TR 61341 :2010, 2.4)
NOTE The beam angle is expressed in degrees ().
3.5 bin restricted range of LED performance characteristics used to delimit a subset of LEDs near a nominal LED performance as identified by photometric performance and forward voltage
NOTE As the result of small but meaningful variations in the manufacturing process of LED wafers and subsequent dies, the electrical and photometric characteristics of LEDs may vary from LED to LED, even when the dies are from the same wafer. LEDs are sorted or binned in accordance with these characteristics, but there is no existing standard for binning.
3.6 built-in LED module
LED module, generally designed to form a replaceable part built into a luminaire. a box, an enclosure or the like and not intended to be mounted outside a luminaire, etc. without special precautions.IEC/TS 62504 pdf download.

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