I have this fixture over my 10 gallon tank:
http://www.hellolights.com/index.asp...PROD&ProdID=94
Actually I have the dual-tube 28 watt (two 14-watt tubes hooked together) but they don't seem to be offering that one anymore. This light I have linked still gives you the same wattage as the one I have - 28 watts total. It is in the medium light range and I do have pressurized CO2. Plants that have done very well under this light include Hydrocotyle verticillata, Bacopa caroliniana, (green and "colorata"), Bacopa australis, Rotala rotundifolia "colorata", Rotala sp. "Vietnam", Marsilea quadrifolia, Ludwigia repens, Pogostemon stellatus "Broad Leaf", Pogostemon helferi, Sagittaria subulata, and Lobelia cardinalis.