I use the ZooMed Aqualamp T5 HO fixtures. I have about 8-9 of them. They, as well as LYR's fixture are HO. You can use the 4way by itself most likely. I like the Aqualamp because it has individual I/O switches for bulbs. So if it was too hot with a 4way, you could turn one bulb off if needed. I am not sure if the LYR has 4 switches. As far as plant lights, 2 6500k daylight bulbs in a quad, should be just fine, especially in a 36" tall tank.