Why 250? Have you considered a 400 watt hps with a dim able ballast? I think for the little extra $$$ you'll be MUCH HAPPIER, can adjust it down to 100w, 200, and 300w... Will have denser and higher yielded buds that way... Please consider even if it means the Cfl's for another week ot two to get the extra $$$
Peace
Yoda looking forward to this grow! What I believe was my green o matic yielded just over an ounce! Pretty decent yield for a plant that I've seen nothing but very small yields from...
Yoda