The Lighthouse Controlled Environment has been redesigned to help you grow your favorite plants indoors. We have improved the zippers, fabrics, ease of assembly, and size options. Our new lighter weight fabric offers better reflectivity and a tighter seal. Zippers are just as strong as ever, with smoother action and reinforced zipper-pulls. These tents are taller (7'2"), and offer multiple ventilation options with bigger, adjustable duct ports (now up to 10").NOTE: Tent sizes given are outside dimensions, sorecommended flood tray sizes are 2' x 2' trays for the3' x 3' tent, 3' x 3' trays for the 4' x 4' tent, 4' x 4' trays for the 5' x 5' tent, 2' x 4' trays for the 5' x 2.5' tent, and3' x 6' trays for the 4' x 8' tent.