Nope, those T8's will be more than sufficient for you. The single best piece of advice anyone ever gave me for planted tanks is to head over to www.ukaps.org and join up - possibly the best source of information for anything that I've ever been part of.
In short, those bulbs are more than sufficient, even if you got a high tech setup with CO2. That said, you may find a pure sand substrate a challenge with a planted tank.
In short, those bulbs are more than sufficient, even if you got a high tech setup with CO2. That said, you may find a pure sand substrate a challenge with a planted tank.