IEC 60809-2021 Lamps and light sources for road vehicles — Dimensional, electrical and luminous requirements. The colour of the light emitted shall be measured by the method specified in Annex B. Each measured value shall lie within the required tolerance area. Moreover, in the case of filament lamps emitting white light, the measured values shall not deviate more than 0,020 units in the x and/or y direction from a point of choice on the Planckian locus 3 . For conformity of production purposes of amber and red colour only, at least 80 % of the measuring results shall lie within the required tolerance area. 4.4.2 Colour endurance Filament lamps, but for conformity of production purposes only colour coated lamps, for use in light signalling devices, shall be operated under test conditions for colour endurance measurements as specified in Annex J. Thereafter the colour of the light shall be measured by the method specified in Annex B, and all measuring results, but for amber and red colour at least 80 % of the measuring results for conformity of production purposes, shall be within the limits specified in 4.4.1 . In the case of colour filter coatings, no cracks in these coatings shall be visible without specific optical tools. Test samples that have been operated under conditions as specified in Annex J shall no longer be used in light signalling devices and shall be considered end of life for that purpose. 4.4.3 Coated bulb In the case of a coated bulb, after the ageing period described in Annex C, C.1 .1 , the surface of the bulb shall be lightly wiped with a cotton cloth soaked in a mixture of 70 % by volume of n-heptane and 30 % by volume of toluol. After about 5 min, the surface shall be inspected visually. It shall not show any apparent changes. 4.5 Lamp dimensions The filament lamp dimensions shall comply with the limiting values given in the lamp drawing or on the relevant filament lamp data sheet. The definition of and the measuring condition for the filament shape, length and position, shall be in accordance with the appropriate requirements of Annex A, Annex D, Annex E and Annex F respectively; this does not apply to non-replaceable filament lamps. 4.6 Caps and bases Filament lamps shall have standard caps or bases as specified on the relevant filament lamp data sheet and shall comply with...
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