I have a General Electric 6500k 48" "Daylight 32" for the plants, it makes a HUGE difference for plants. Lowes sells the bulb in a 2 pack, and has the dual fixture at a low price, so you can have your 5.0 in one side, plant bulb in the other.
The 5.0 bulb should be fine. I have no problem with my plants. If it looks like its dying give it some Co2. That will bring it back to life until you figure out a good lighting system.
I have a 48" dual shop light with a 6500 bulb in it and my reptisun 5.0 blulb. My plants have done great I have only lost one plant and that was my jasmin =[