For the 2021 Audi Q3, both the low-beam and high-beam headlights use integrated LED lighting. The supplied fitment data does not list a separate halogen or HID option, nor does it identify a projector versus non-projector headlight variation, so no alternate headlight bulb size is specified.
Exterior lighting is broadly LED-equipped as well. The front and rear turn signals, daytime running lights, parking lights, side markers, tail lights, brake lights, center stop light, and reverse lights are all listed as LED. The license plate, step, and vanity lights also use LED sources.
No fog-light fitment is provided for this model year in the supplied data. When replacing a light, verify whether the component is an integrated LED assembly or a serviceable bulb before ordering, since the data identifies the light source as LED but does not provide a replaceable bulb code.