The plan doesn't really work that way. I don't know why they do it the way they do, but if you are going to stop using lites, then you move up a plan and just don't eat the lites. So, if you do plan 2 with lites, then you would follow plan 3 and eliminate the lites. Or, if you do purple w/ lites, you would move up to red and not do lites. there really is no exchange for lites.......you either do them, or you don't. It is a very personal choice, and many of the people on this board have lost very well with and without lites