Daylight bulbs have a blue spectrum like 6400k or so, what you want for flowering is the kitchen and bath floros, they have a 3300k spectrum. :P
I found them at walmart $9 for 2., and don't worry so much about the lumens, because the closeness of the tubes delivers the light very efficiently to the leaves. You see, higher power lights produce more heat and must be placed further away from the plants and as the light is further away less lumens are delivered for example: a 1000w light 4" away delivers 140,000 lumens to the plants, the same light at 8" delivers 35,000 lumens to the plants, and so on.

You want more red spectrum for flowering, this is why sodium lights kick so much ass for flowering, a sodium light has a 3500k spectrum which is very close to the soft white floros, and the kitchen and bath floro.

BTW the kitchen and bath bulbs have about 3000 lumens per tube.