And maybe nobody is sure about it? So I will try to put some stoned logic
If I have 16 plants in my main box under 2 x 400W HID (~100 lumens per watt) that is 80K lumens or 5K lumens per plant. Fluorescent lamps produce 68 lumens per watt, so 2x60W CFL or 120W total will produce 8160 lumens.
Conclusion is that this 2x60W cfl will be more than enough, maybe even too much for the clones if you keep them at the same spot.
WOW I even amazed myself with this lol. I will give it a try.