Save on electricity??? Uhhh, solar panels?
You will be better off using 1 kind of hydro system for your plants throughout both veg and flowering. DWC is a passive system, and if you start with that, you will finish with it. The plant will grow into it's system.
Ebb&flow is an active system, so if you are flooding your medium, then you grow that way throughout.
Get started with the CFLs, and you can always improve.
HTH
