No. Plants use only red-orange and blue- indigo parts of the spectrum.
Don't worry about 6500 K. If you can get something in the 5000 K, that's just fine. Plants will do fine between 4000-5500.
10,000 K doesn't have much effect on plants. Its only important in deeper tanks for coral.
6500 K is more for aesthetics, but I like the warmer bulbs for vivariums.
However, 2700 K, a standard screw in compact fluorescent doesn't have enough blue for good plant growth, but has more red. Red promotes flowering.
The only time you'll notice a difference in growth is if you use very high wattage. There are other factors like PAR rating, etc. However, it shouldn't matter too much if you're going with lower intensity lighting like VHO.