Understanding your BMW 3 Convertible (E46) bulb sizes makes it easy to change the vehicle's appearance and brings instant performance or comfort benefits. Check out BMW 3 Convertible (E46) light bulb list to see precisely what kind of lamp you need and how much it will cost you to replace an old bulb. BMW 3 Convertible (E46) LED lights are the best and most energy-efficient lighting type, but they are also very pricey.