"This International Standard is applicable to lamps (filament lamps@ discharge lamps and LED light sources) to be used in headlamps@ fog-lamps and signalling lamps for road vehicles. It is especially applicable to those lamps which are listed in IEC 60809. However@ the standard may also be used for other lamps falling under the scope of this standard. It specifies requirements and test methods for the measurement of performance characteristics such as lamp life@ lumen maintenance@ torsion strength@ glass bulb strength and resistance to vibration and shock. Moreover@ information on temperature limits@ maximum lamp outlines and maximum tolerable voltage surges is given for the guidance of lighting and electrical equipment design. For some of the requirements given in this standard@ reference is made to data given in tables. For lamps not listed in such tables@ the relevant data are supplied by the lamp manufacturer or responsible vendor. The performance requirements are additional to the basic requirements specified in IEC 60809. They are@ however@ not intended to be used by authorities for legal type-approval purposes. NOTE 1 In the various vocabularies and standards@ different terms are used for ""incandescent lamp"" (IEV 845-07-04) and ""discharge lamp"" (IEV 845-07-17). In this standard@ ""filament lamp"" and ""discharge lamp"" are used. However@ where only ""lamp"" is written both types are meant@ unless the context clearly shows that it applies to one type only. NOTE 2 This standard does not apply to luminaires. NOTE 3 In this standard@ the term LED light source is used@ in other standards the term LED lamps may be used to describe similar products."