the only way i would flower with that is if i flowered clones right after they rooted. its a good light but the penetration is less than an HID would be.

the reason i wouldnt flower at 10 inches is because there is a great chance the plant is not fully mature to throw into flower...resulting in a longer flowering time and a taller plant.
but thats my opinion, i have been interested in a t5 for a long time now, whatever you plan on doing, i would be interested in the results with the light.