I am involved with a greenhouse that will be using 356 1000 watt HPS lights. They will be split into two banks that will run at alternate 12 hour cycles, so potentially 178 will come on all at once. I havent received the specs on the ballast yet so I dont even know if they will be magnetic or electronic. I dont have any experience with large contactor controller lighting banks so I was wondering if this could be a potential issue? If so I could use a few time delay relays to split them up if necessary. Are there any standard practices or "rules of thumb" for large banks of HID lighting short of obtaining a unit and directly measuring the inrush? I noticed Siemens has breakers designed for HID lighting. The supply will be 120Y/208. Thanks.