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Yes 6 watts of light is almost nothing in a 2.5 gallon tank. You'd probably be able to grow moss and java fern but that's about it. Even those plants my suffer. You should go with 3 if you want to grow anything. 18 watts would give you decent light to grow a lot of things.
Or you could ditch that little lamp, get yourself an incadescent fixture gut it out, put it in there and place one spiral compact flourescent light that could be 20 watts from one light.
Or you could ditch that little lamp, get yourself an incadescent fixture gut it out, put it in there and place one spiral compact flourescent light that could be 20 watts from one light.