Hey berry..

when you say they grew slow.. Were they(the lights) producing the same amount of nodes but were just shorter (vertically?)..

A 250 watt bulb may produce TALLER plants than a 400 watt bulb in the same amount of time.. because the plants under the 250 watt bulb will be stretching,,, but the 400 watt bulb should produce equal and more nodes..

NODES are what is important.. not height..



keep us posted..
cheers