depends on your number of plants and as said whether those are 100 watt equivalent (i bet you) or 100 watt actual. by the time you are flowering you want at least 3000 lumens per square foot of growing area and preferably 7000 to 10000 lumens per square foot.
to help you:
cfl 13 actual watts/60 equivalent: 850 lumens
cfl 26 actual watts/100 equivalent: 1,750 lumens
cfl 42 actual watts/150 equivalent: 2,750 lumens
cfl 68 actual watts/250 equivalent: 4,200 lumens