Well i have 8-40 watt cfls 4-26watts and 2-13 watts for side lighting.iI really dont think its the lights as i move the plant down a notch to accomidate the growth, so the lights are never more than a inch or 2 away.I have about 500 watta of cfls in a cabinet 2' wide 16inches deep and 4' tall and it very light proof. Maybee some of the stretch is from transplanting from a 1 gallon pot to a 4 gallon pot 2 days b4 flowering. Anyway she grew another half inch last night instead of 2 inches so maybee thats a good sign.....we will see i guess. As far as lumens go. I have over 30k lumens. So i think for the space im growing in that is not to bad. This is my first grow so feel free th chime in!:rasta: