Providing the running gear for the lamp is 11w, no. The main thing to look out for is the colour temperature of the lamp and the depth of your tank.. AquaOne do lamps for their small tanks that are 300mm high and are 11w that are fine for growing plants such as java fern, some crypts and ambulia.
This is about as low tech as you get - my daughter's AquaStart320 - severely neglected, overstocked, few water changes, lights don't go on some days, no ferts - which is probably why the crypts have not multiplied. Ambulia got pruned and replanted two days ago.