c Correction factor for the nominal voltage of the High Voltage battery $C_{{\mathrm{CO}}_2}$ CO2 savings [g CO2/km] CO2 Carbon dioxide $k_{{\mathrm{CO}}_2}$ CO2 correction factor [gCO2/km · Ah], as defined in Regulation UN/ECE No 101, Annex 8 m Number of efficient exterior LED lights composing the package n Number of measurements of the sample P Power consumption of the vehicle light [W] $S_{P_{\mathrm{EI}}}$ Standard deviation of the LED light power consumption [W] $S_{\overline{P_{\mathrm{EI}}}}$ Standard deviation of the LED light power consumption mean [W] $S_{C_{{\mathrm{CO}}_2}}$ Standard deviation of the total CO2 savings [g CO2/km] t Driving duration of the NEDC [s], which is 1 180 s UF Usage factor of the vehicle light [-] as defined in Table 2 $V_{{\mathrm{HV}}_{\mathrm{nom}}}$ Nominal voltage of the High Voltage battery (traction battery) [V] $V_{{\mathrm{HV}}_{\mathrm{op}}}$ Operative voltage of the High Voltage battery (traction battery) [V] Sensitivity of calculated CO2 savings related to the LED light power consumption Sensitivity of calculated CO2 savings related to the CO2 correction factor

ηDCDC Efficiency of the DC-DC converter

Index (i) refers to vehicle lights

Index (j) refers to measurement of the sample

B Baseline EI Eco-innovative

where the power consumption of the corresponding baseline vehicle light is defined by Table 1.

Power requirements for different baseline vehicle lights

Vehicle light	Total electric power (PB)[W]
Low beam headlamp	137
High beam headlamp	150
Front position	12
Licence plate	12
Front fog lamp	124
Rear fog lamp	26
Front turn signal lamp	13
Rear turn signal lamp	13
Reversing lamp	52

where

UF Usage factor of the vehicle light [-] as defined in Table 2. t Driving duration of the NEDC [s], which is 1 180 s $k_{{\mathrm{CO}}_2}$ CO2 correction factor [gCO2/km · Ah], as defined in Regulation UN/ECE No 101, Annex 8 ηDCDC Efficiency of the DC-DC converter [-] $V_{{\mathrm{HV}}_{\mathrm{op}}}$ Operative voltage of the High Voltage battery (traction battery) [V], defined by Formula 3

where

$V_{{\mathrm{HV}}_{\mathrm{nom}}}$ Nominal voltage of the High Voltage battery (traction battery) [V] c Correction factor for the nominal voltage of the High Voltage battery, which is 0,90 for nickel-metal hydride (NiMH) high voltage batteries [-]

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.

Usage factor for different vehicle lights

Vehicle light	Usage factor (UF)[-]
Low beam headlamp	0,33
High beam headlamp	0,03
Front position	0,36
Licence plate	0,36
Front fog lamp	0,01
Rear fog lamp	0,01
Front turn signal lamp	0,15
Rear turn signal lamp	0,15
Reversing lamp	0,01

where:

n Number of measurements of the sample, which is at least 5

The CO2-emission correction coefficient $k_{{\mathrm{CO}}_2}$ shall be determined from a set of T measurements performed by the manufacturer, as defined in Regulation UN/ECE No 101, Annex 8. For each measurement, the electricity balance during the test and the measured CO2-emissions shall be recorded.

In order to evaluate the statistical error of $k_{{\mathrm{CO}}_2}$ , all T combinations without repetitions of T-1 measurements has to be used to extrapolate T different values of $k_{{\mathrm{CO}}_2}$ (i.e. $k_{{\mathrm{CO}}_{2_t}}$ ). The extrapolation shall be performed according to the method defined in Regulation UN/ECE No 101, Annex 8.

The standard deviation of $k_{{\mathrm{CO}}_2}\left(S_{\stackrel{–}{k_{{\mathrm{CO}}_2}}}\right)$ is thus calculated as defined by Formula 5.

where:

T Number of measurements performed by the manufacturer for the extrapolation of the $k_{{\mathrm{CO}}_2}$ as defined in Regulation UN/ECE No 101, Annex 8 $\stackrel{–}{k_{{\mathrm{CO}}_2}}$ mean of the T values of $k_{{\mathrm{CO}}_{2_t}}$

The standard deviation of the power consumption of each efficient exterior LED light ( $S_{\stackrel{–}{P_{{\mathrm{EI}}_i}}}$ ) and the standard deviation of the $k_{{\mathrm{CO}}_2}\left(S_{\stackrel{–}{k_{{\mathrm{CO}}_2}}}\right)$ lead to an error in the CO2 savings ( $S_{C_{{\mathrm{CO}}_2}}$ ). This error is to be calculated by means of Formula 6.

It has to be demonstrated for each type, variant and version of a vehicle fitted with the package of the efficient exterior LED lights that the error in the CO2 savings calculated with Formula 6 is not greater than the difference between the total CO2 savings and the minimum savings threshold specified in Article 9(1) of Implementing Regulation (EU) No 725/2011 (see Formula 7).