Flora - I was thinking that (about trying 2 - 6,500K's) right after I posted. I think that would give good lighting and definitely minimize algae growth. OR you could keep the light the way you have it and start experimenting with your CO2 system and nutrient regimen to match the demands of the lights (though I'd imagine that would be wayyy costly).

I think lighting for tanks should be based more on Kelvin/color temperature rather than wattage. And knowledge of color temperature and how it affects plants is invaluable.

As far as I see it, keeping a planted tank is all about combining and stabilizing the variables (light, CO2, nutrients, water temp, flow, fish load, volume, etc) in such a way that it produces the best results. Define a constant and set the other variables around that. Easier said than done. It just takes time and a lot of research