The 2020 Volkswagen Atlas uses LED bulbs for both the low-beam and high-beam headlights, along with LED daytime running lights, front turn signals, parking lights, and front side markers. No separate halogen headlight bulb size is listed for this model year.
Rear lighting has a notable configuration difference: vehicles with LED tail lights use an LED brake light, while models without LED tail lights use a 7440R brake-light bulb. The tail light itself is listed as LED, and the rear turn signal uses a 7507 bulb. The reverse light uses a 921 bulb.
For replacement interior bulbs, the dome, map, trunk, and general interior lights use 2825 bulbs. The glove-box and step lights use 2821 bulbs, while the vanity light uses a 6418 bulb. The center stop light and license-plate light are LED.