Taken from the blue book, it needs clarification. Not sure whether the fogs comply:
5.1. A rearward facing red warning light of a minimum
of 21 watts, with surface area minimum 20cm2
,
maximum 40cm2
, or of 21 watts with a surface area
minimum of 50cm2
and with lens and reflector to EU
Standards, must be located within 10cm of the centre
line of the vehicle and be clearly visible from the rear.
Vehicles fitted with full width bodywork may
alternatively use two lights equally located about the
vehicle centre line. An alternative light unit of equal or
enhanced constant luminosity or LED lights that are
either homologated by the FIA or comply with relevant
EU Regulations may be used.
5.2. The warning light must be switched on when
visibility conditions are reduced, or as detailed within
championship and/or event regulations, or when so
instructed by the Clerk of the Course.