| Green and White Teas have very little caffeine in them. Traditional English black tea has about 1/2 the caffeine you'd find in coffee. Green and white teas have less caffeine that black tea. I'm not sure where red tea fits in with it all.
I've heard several people say that tea has more caffeine than coffee, but that is not true. However, tea may give you more of a kick due to different chemicals that naturally occur in tea leaves. | 
