That is good advice. The 8ft lights are going to be wasting lumens due to their length and unused space. I have 6 plants vegging under 2 dual 4 foot fluoro lights. I used 2 GE Kitchen & Bath and 2 GE Plant and Aquarium (one of each bulb per 2 light fixture. This has given me incredible growth. About 3 inches per week from the time I transplanted. Just make sure to keep the lights anywhere from 2-7 inches from the tops. Closer is better, but do not let them touch or else the lights will burn the plants. You could also use Ge Daylight bulbs, instead of one of the other bulb types, to give more blue light during veg.

Also, making a little grow room with walls painted a flat white will help reflect as much light as possible. Just make sure you can easily move the lights upward as the plants grow, and that you give them enough air circulation and venting.
Hope this helps