The 1K4 is like having 4 ballasts all in one box, but wait for it, FOR HALF THE PRICE! A deal like this is almost surreal! There is no other product like this on the market. *Four individual dimmable channels – 1000, 600 and 400 Watts Built-in Lighting Controller with 120/240 volt trigger cable Built-in flip box runs 8 lights, (4 lights at a time) Connects to a single 30 amp 240 volt breaker Runs MH or HPS bulbs *Completely digital Low RF Noise Eights standard lamp receptacles, your lights will plug right in Easy to wire, solid machined-brass fittings Includes pH probe and TDS Sensor Stealth Startup This feature lights up each channel a random 1 seconds to 90 seconds after the last channel to keep the power company's new digital meters from identifying the load as a room full of grow lights. Top growers asked for this feature, and we built it. Exclusively from PurGro. Technical Specs At 92% efficiency and a crest factor of < 1.7, this is one sweet ballast. Strike voltage is well over 3000 volts to light the longest cables and the oldest lamps. Total Harmonic Distortion is less than 10% for low RF noise and minimal acoustic signature, and Power Factor is actively corrected to greater than 0.99 for maximum efficiency in power conversion. This is as good as a ballast gets! Built from scratch by PurGro, by growers for growers. Everyone asked for the flip version, so we made it standard! Built-in controller, built-in flip and four 1000 Watt dimmable channels. Field repairable, too. Your PurGro dealer can fix these ballasts right in the store with a simple Field Repair kit from PurGro. Try THAT with anyone's else's digital ballast. Solid equipment, great price, and you can actually fix it yourself. Instruction Manual