plants under 2 4' fluorescents
 

Slow start: I kept my plants under 2 4' fluorescents until they were about 1 1/2 feet tall. Lower branches are small on all plants three plants still 1 ft. tall the rest 2 1/2 ft. are they bad plants or is it due to low light. now I have a 400 MH for the last week. Will they get bushier under the new light.

It's the different variety of plant is what determines if a plant is bushy or spindly. Some plants do poorly no mater how good your grow rooms is because good indoor plants are bread. When you get a plant with good characteristics clone it over and over again to keep it going. You can take a clone from a clone for a couple years before losing it.