You mean CFL's? I doubt they are really 100 watt. Probably '100 watt equivalent'. What is the color temperature? Something around 6400k is best for vegging.
Sure but you'll need more what counts is actual watts. They use equiv watts to compare them to incadenscents. 100w equal bulbs are generally 23-24 watters.
There is minimal difference between 2700K and 6500K fluorescents as regards to the amount of red and blue. Either one is fine for the entire growth of the plant.