Hey Shake,

Thank's for the wiki answer. I believe when we deal with a plants cycle, "light-independent" reactions simple means "you don't need light to have it happen" and you are right that it could happen even with light present.

But keep in mind, while the science is in on "vegative" or in horticultural terms "immature" stage, the science is still not clear about the "flowering", or "mature prepoductive" stage. There is still a lot to learn from our beloved plant.
There has been some research that seem to suggest some flower brix conversions only take place in darkness. ( this may be the idea behind some peoples suggestion to put the plants in darkness 1 or more days before harvest.)