I have two T5HO 48" bulbs on my 120 gallon discus biotope. Both Geissman bulbs, a Midday which is 6000k(daylight) and an aqua flora not sure the kelvin (a lot of magenta). The magenta in the flora will bring out the reds in your discus and cover the red spectrum for plants. The midday covers your blue spectrum. My tank is mostly moss and does well with this combo and my discus colors look nice.
Any bulb that claims it will brighten fish colors(colormax etc) will likely be in the red spectrum. It's great for pigeon blood discus btw.