Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
It does matter.
Most kits do not have the right light to grow plants.
Can you tell us more about the light you have?
All other info?
Have a look though the lighting forum for a lot more info, but here are the bare-bones basics:
For T-8 and T-12, wpg is not too far off. A 55 is pretty tall, I would aim for at least 2 wpg just for a low light tank. The light needs to be the right color for the plants. They use certain wavelengths more than others. A bulb that is rich in those wavelengths will grow the plants better, though it might make some colors in the tank (like orange fish) look funny.