i have just upgraded my tubes to Arcadia Original Tropical Lamps, they take on a pinkish glow in the tank and really magnifies any red/orange fish (i have a red clawed crab which now looks awesome.
apparently it's better for plant growth but to be honest i haven't noticed any difference (plants have always looked good and they still do)
depending on how large your tank is theyre quite cheap.
i would definatly recommend adding reflectors if you haven't already as they double the light output.
to give an idea upgraded tube and reflector for a 60L tank cost about £18, same on a 180L (which has 2 tubes and 2 reflectors) about £50.
well worth it in my opinion.