eden, if you are not using any fertilizers then that may be why your plants are not doing so well. I have wysteria, sword, anubias and now the DHG under LED's and they are doing well. At one time I had anacharis in there too but it melted during a rescaping project and never recovered. my tank gets a little indirect sunlight everyday but the LED's provide the majority of the light.
most people pick up the CFL corkscrew light and either a desk lamp that has a long arm or a clamp on style and use that over their tank. Anything in the 13w range is fine so long as it is the 6500K color temperature.