So here's my situation: the company I work for will be selling sets of classroom furniture. There are four sets. Each set is an entire classroom. The idea is that inside one of our warehouses we will build a "classroom" that is 20'w x 20'l x 8'h to photograph the sets of furniture in. So, what I need to calculate is the amount of lighting I need to adequately light this room. How many watts will be necessary to light this space? There will be no ceiling so lighting will be coming from above and from one maybe two lateral sides. Are there any equations that will tell me how many watts of strobe lighting I will need to light 3,200 cubic feet? I'm used to product, people and landscape shots. This is a new scenario for me so any help would be greatly appreciated!