Division 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.