I've attached a photo showing what spectrums of light are best absorbed by photosynthesis using chlorophyll A and chlorophyll B. Using Kelvin we can use this formula to determine light spectrum in nm (nanometers.)

3,000,0000/K temp = nm

So at 9325K the math come to 321nm.

So, from the attached graph you can see that the plant is absorbing the most light at the two peaks for blue and red. I agree that blue and red light emitted from your bulbs might sound ideal but I'm not sure as they fall anywhere near the absorption levels as a normal 6500K Daylight bulb would do. I've haven't seen too much evidence so I'll leave it up to you or anyone else that knows a bit more to lend me advice.

The bulbs many people use (6500K) fall in the 462nm range. You can see they are a little closer to those peaks between chloroA and chloroB in the blue spectrum.