In terms of endgame gear, such as Tionese, Columi, Rakata, Black Hole, Battlemaster etc, there is no requirement to have a certain amount of Light/Dark side points at all.
In terms of gear you get for leveling up, there isn't any gear out there that says something like 'must be Light I or below' or something like that, if that's what you mean. Most of the gear out there, like the gear you get for completing mission and/or the gear you can buy for Commandations, doesn't have a requirement. The only place you will run into trouble is in terms of relics. All of them, if I'm not mistaken, have some kind of Light/Dark side requirement for them, at least the relics that you can buy while leveling up. In endgame relics, there aren't any requirements at all. Hope this helped!
There actually are certain light sabers that still require certain light/dark levels.