My g3 had halogens in the low beam projector housing. I could barely see at night or in bad weather with them. I replaced them with a modified xenon gas hid bulb that came with a built in ballast from Amazon. They are now very bright and won't dazzle other drivers because the projectors have a beam cut-off inside.

Expensive cars like Audi or BMW can have all LED taillights. LEDs can be cheap, but bulbs and bulb housings are cheaper. The https://lowbeambulb.com/ service can help you choose the right bulbs as there are diagrams and specifications to help you buy the right headlights for your car brand. The high luminous qualities allow you to create a pleasant atmosphere in an illuminated room.