BTW....get the canopy and go for that 26watt CFL. You cannot beat this. If RSS could achieve this with a single compact flouroscent, you should have no problems growing any plants.
PS: pic below stolen from RSS's terrarium thread linked in this thread. Holy crap that ceph is fantastic btw. great job. An example of the very setup I want to make with LED and a full 360 degree viewpoint glass tank.
DSC_0113 by Simprs, on Flickr