You are supposed to use the bulb color that matches your lense. If it is a red lense, you are supposed to use the red LEDs. I'm not sure why. I'm guessing that they are much brighter, and they won't appear red enough. ???
As for what I think... I don't know. I'd have to see them on the car to figure out if I like them, and that requires buying them first. I may try them on my waGoN, just because the lenses in the back are so small, and they only have one bulb per side for brakes. I want to make sure people can see them.