If you must have lights that sit on the tank, two Fluval Plant Spectrum 3.0 would be a good choice. Very nice spectrum control with your smart phone.
If it was my tank, I would suspend two Waveform PhotonPanel 4000k grow lights with dimmers over it. I have one on a 36" wide tank 18" deep with the dimmer output at about 75%. Astonishingly powerful in a pleasing spectrum. Waveform also makes LED bulbs in T5 and T8 shapes 48" long.