Plants that grow tall and wide can be broken down by rosette plants and stem plants. Any of the larger sword species would work as will aponogeton plants. They just need time unless you can source large plants like the mother plants that I got myself.
If you want to go with stems, there are several easy stem plants that can be planted thick to create the width you want. Green cabomba, water wisteria, hygrophila corymbosa, hygrophila angustofolia , water sprite, and bacopa come to mind as easy plants that grow bushy and tall.
Did you see the photo I posted right above your post? These are husky brand Home Depot pendent LED lights that a local LFS is using. It is working for their low-medium plants. I was shocked and impressed. Might want tk look into those.