Thats a decent amount of light for a 40B, which is a relatively shallow tank. For easy low maintenance I would suggest java ferns, mosses, crypts, anubias, some swords, and certain stem plants, L. repens, H. difformis, M. mattogrossense are just a few that come to mind. With that amount of light though you could even do some more demanding plants, just keep in mind planted tanks are about balance, higher light can bring about the need for a co2 source or ferts. If you start getting algae it can be possible to dim down the lights a bit with some floating plants.