Changed them all, inside & out. Kept the back seat white for looking for stuff, but front overheads are red, & not because it's a cool thing to do. At night, our vision can take up to 45 minutes to fully adjust after being exposed to 'white' light, even just opening door/getting in/closing door. Think about the reptile & bat exhibits @ the zoos - red lights for night vision. Laser sights on firearms. You get the picture. I work/drive in the dark, & the change to red made more difference than I ever imagined.