300w CFL to keep mothers

Hi guys, I have decided to stop using Auto and to start doing my own clone. I was planning to keep 4 Mothers in a 120X120X180 tent and use A 300w CFL as a light, do you think that would be sufficient? I have a spare 600w ballast with light bulb and reflector but rather not using it to save on £££ in electric and also keep the temperature controlled.
what you guys think?

120 x 120 What? CM, Inches?? At any rate, you only need a little bit of light, but it would be nice to have even coverage over all the plants so that you have something to take cuttings. If it were me I might suggest two smaller CFL spread out a bit... but it does matter what size the plants are too. I sure wouldn't use an HID for keeping mothers.