The 2015 growing season will be a far cry from 2014.  We ended up starting so well, but I think we overheated it.  This is a picture from inside the greenhouse last season.  We only turned those lights on cold nights, but we think it was too warm.  The lights are strung in between slats and the trays sit on top.  We built the tiered racks.  

We do love the greenhouse and though it's not large, it holds quite a bit.  We use this as an intermediary spot prior to the plants going into the ground.  Ours is similar to this one.