I've seen similar pics from grows in the Netherlands, not sure what they call it Vote boom 2017 Testers wanted for Mars Hydro COB Testers wanted for Mars Hydro COB
Vertical hydroponics. The most efficient way to fill a space with plants. If you think about a traditional grow room we only use the floor. If you remove the hood the light emits in 360 degrees. There's a lot more space for growing if you use the walls as well. You can fit much more but in the same amount of space with the same light. There's many commercially available grow room kits based on vertical hydroponics. Google won't let me go there but howtogrowmarijuana.com has a great article on the practice. Several companies make turn key kits. This one is only about $5000 Big Buddha Box 9' x 9' Vertical Hydroponic Grow Room with Gorilla Grow Tent www.amazon.com/Supercloset-Buddha-400w-Hydroponic-System/dp/B0050E7VR6
You can grow 2 times the bud at least with the same light and space but it's much more cost and work. Your choice. If you search vertical scrog you'll find some stuff.