Below is a list of light bulb types used in 2014- AUDI TT lighting system, covering convertible and coupé vehicles.
Headlight bulb: low beam - D5S / high beam - D5S
Cornering light bulb: H8
Door safety light bulb: W5W
Boot light bulb: W5W
Glove compartment light bulb: W5W
Light bulb sizes for other AUDI TT generations: TT (8N) / TT (8J)