# Commission Implementing Decision (EU) 2019/1119 of 28 June 2019 on the approval of efficient vehicle exterior lighting using light emitting diodes for use in internal combustion engine vehicles and non-externally chargeable hybrid electrified vehicles as an innovative technology for reducing CO2 emissions from passenger cars pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council (Text with EEA relevance), Division: Formula 4

Extent: E+W+S+N.I.

C CO 2 = ∑ m i = 1 ΔP i × UF i v × η DCDC × K CO 2 Where:
ηDCDC Efficiency of the DC-DC converter
K CO 2 CO2 correction factor gCO 2 km ∕ Wh km , as defined in paragraph 2.2 of Appendix 2 to Sub-Annex 8 to Annex XXI to Regulation (EU) 2017/1151.
The efficiency of the DC-DC converter (ηDCDC ) shall be evaluated in accordance with the appropriate vehicle architecture, as specified in Table 7:
Table 7
Efficiency of the DC-DC converter for different vehicle light architectures
#
Architecture
ηDCDC
1
Lights connected in parallel to the low voltage battery (lights fed directly from the high voltage battery via DCDC converter)
0,xx
2
Lights connected in series after the low voltage battery, and the low voltage battery connected in series to the High voltage battery
1
3
High Voltage and low voltage batteries have exactly the same voltage (12 V, 48 V,…) as the lights
1
For architecture #1, the efficiency of the DC-DC converter (ηDCDC ) shall be the highest value resulting from the efficiency tests performed in the operative electric current range. The measuring interval shall be equal or lower than 10 % of the operative electric current range.

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Source: https://www.legislation.gov.uk/eudn/2019/1119/annex/division/4/division/4.1/division/4.1.2/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2019-1119/annex/division-4/division-4.1/division-4.1.2/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.