I never understood why Coke doesn't sell Coke Light like they do in Europe. To me, it tastes almost like regular Coke.

I hope you're kidding ! Coke light tastes nothing like regular coke! I know, cause my girlfriend makes me drink it now and then, because it's all she'll buy. I hate it with a passion!
That new Coke Light lemon OTOH is a good compromise. I still don't like it as much as the original coke, but at least it's drinkable, unlike coke light. (Yuck!)

Then again, colours and tastes...