Bamboo blinds?

Okay, I am redoing the bedroom now! I washed my comforter this weekend and the stuffing mushed up on one side and it looked terrible, so I sent shopping, lol. I found a gorgerous new Croscil (sp?)set on sale on Belk for $115 (was $375!!) and a matching sheet set that were marked way down also. I am thinking of changing window treatments to bamboo blinds, but wondering if this would make my bedroom a lot darker than the blinds+sheers I now have. Anyone out there have bamboo blinds? How much light filters through? Susan