I recently found 44 watt CFL lamps in Staples for under $5. That's a deal! They were $8 in Walmart.
I am using (4) T5HO 54 watt tubes for supplemental lighting during bloom for nine plants in 5 gallon pails. I have 'grow' and 'bloom' spectrum lamps. At the moment I'm using two of each. I think maybe a full spectrum has an advantage over one or the other.