t-5 and mh are more intense and maintain their intensity deeper into the water. PC's are only intense for the first foot into the water and then the intensity drops off sharply. In a 29 gallon, you would be able to successfully keep say a BTA and a pair of clowns with any of the lights mentioned.
There is more on lighting in the forum entitled "lighting, filtration, and equipment." And there are threads on T-5s and probably mh's there, too. What are the dimensiona of your tank?