Any idea what temp that tube burns at?

for a CFL you'd want 5000k-6500k for vegging and 2700k for flowering.

Once those get big in a few weeks i'd suggest more light for a bigger yield. Looks like you got 4 plants there which means you should only count on 2 to produce you any bud.

The local Lowe's or Home Depot will have the CFL's you need, I'd suggest 3-4 minimum, maybe more when they get bigger. You could probly just mount a cheap surge protector and plug the bulbs directly in with a couple adapters.

What light cycle do you have them on? I'd suggest 24hrs a day until they get their 3rd to 4th set of leaves then switch them to 18-6.