Unless you want to start a light collection, why not use what you got already? Give it some time and see how the tank does with it.
If you feel it's too much light, I would add floating plants like Salvinia minima, water, lettuce, frog bit, water sprite, or even a water hyacinth. You can use these plants to serve multiple duties: cutting the light that reaches the tank, keep the tank more stable by consuming extra nutrients and undesirable substances, get a more "wild" natural look with their long trailing roots, provide home for microorganisms and hiding places for fry. Very much Walstad-like approach, imho. By controlling how much of you surface is covered with plants, you can somewhat adjust all of the above.
Another, mid-road, approach would be to let plants like your Ludwidgia grow taller then the tank and start trailing over the surface.
Bump: one type that I left out are lillies. Plants lake dwarf water Lilly (N. stellata) are naturally red, do not require any special care, and their floating leaves do provide shade to the plants below. One choice not to be overlooked.
You get yet another benefit with a light that is a bit above the tank, like providing light to emergent plants. One "green" approach is to plant your HOB (search TPT for pictures and plant selection). That's another way to bring a tank closer to a self-sustaining, self-regulated ecosystem.
In short, I say invest your money into more / other plants before you start changing the equipment you already have. What you got is functional enough.
One side recommendation: put some carboard, paper, plastic mat etc on the outside of the back wall: it will hide the wires and equipment, make your plants stand out more, and let you experiment with different background colors. Try a mirror, black, grey, yellow, blue, orange backgrounds - each one will transform the look of the tank.
Courtesy * Integrity * Perseverance * Indominable Spirit * and Self Control
Tenets of TKD
Last edited by OVT; 07-20-2016 at 06:54 AM.