Ok so you add about another few days worth of lighting. Thats about it.

Remember the CFL you buy is almost always rated at the "equivalent watts", not neccessarily the true watt output.

In reality, you can probably grow with your CFL and the added "100 WATT" setup for about 3 weeks.

The CFL's you want are not generally found in a hardware store. You need Full Spectrum Lighting. These lights are not cheap.

Their advantages lie in:

1) Operating costs. The are very low energy users.
2) Low heat output. It may eliminated the need for forced exhausts and will be cooler on the grow box or grow area.

Other than that, thats about all the advantages. To get the right lights, you gotta spend some dough on them.

If you want full, ripe and short bushy mini-trees, you need to be prepared for the grow boom that starts at about week 3.

The cheap CFL's you have just wont be ready for the challenge.

Again you can grow with them, but you wont be doing the plants any favors with them.

Sorry.

Here is a pic of one of mine grown for 31 days under 2 CFL, 6400K. It will be very difficult to grow this with 25W = 100W CFL's..... no matter how many you use.