First off, welcome to AquariumAdvice Island Boy
I have a tank with the Current USA Orbit fixtures and love them. They are a little pricey but they've worked beautifully for me: the fans are quiet and the moonlights really make watching the tank at night interesting (and no they don't bother the plants or fish).
lights, 6700K is probably the best bet for a good plant bulb. Any lights within the 5000-10000K range should work just fine for keeping plants but in tests the 6700K lamps have been shown to emit the most photosynthetically active radiation (PAR) of any CF
lamp. If you like the color of 6700K then I would go with it.
I can't say that one company makes better bulbs than another. I get all my lights from www.hellolights.com
. They've got great prices and their bulbs have always worked great for me.
Do you realize that CO2
supplementation will be a necessity if you've got nearly 4.5 watts per gallon of light over a tank? You will need to consider CO2
and a fertilization regimen because that much light will be driving your plant growth like crazy and without CO2
you'll end up with horrible algae issues. There are some great stickies in this forum that explain CO2
As to your problems with the radican swords - swords are heavy root feeders and so benefit greatly from a nutrient-rich substrate. Using a specialized plant substrate or supplementing the substrate with root tabs will do wonders for helping your sword plants grow