Well I think reaching the bottom it will but enough of it I don't think so, all depends. JMO, I hear some claims don't require as much lights as others but I was told this by my LFS so I don't hold to that. 660 VHO is a good bit of lighting, I think you may need to find the right ones to keep.
I would think you would be able to keep Squamosa clams at the bottom of the tank....and BTA's are able to be kept in less light than other anemones.
What size is your tank, and how many VHO bulbs are you running over it?