Below is a list of light bulb types used in 2013- BMW 4 Series lighting system, covering convertible and coupé vehicles.
Headlight bulb: low beam - D1S / high beam - D1S
Fog light bulb: H8
Rear indicator/turn signal bulb: P21W
Brake light bulb: H21W
Rear fog light bulb: H21W
Interior light bulb: W5W
Glove compartment light bulb: W5W