Sometimes it seems like you can't catch a break, doesn't it ? Swords are not high light by any means.. but the more light they get, the faster they grow. They can outgrow a tank easily given the chance, if you have one of the bigger species.
Low to medium light plants will do very well with 6500 or 6700 K
tubes over them and so will a number of the more demanding plants. If you want to grow carpeting plants, or some of the really red ones, then you might need those 10,000 Ks, as the low growing carpet types are much more demanding, and being so far from the light, less of it gets to them.
Edit.. in any case, good luck with it. I'm off for now.. have to get up early.