The 4000W Poultry House Intelligent Dimming System is used in conjunction with VBLFT-730-F-50 & VBLFT-730-F-30 tubes to provide dawn to dusk simulation. The IK08 dimmers are available in a 2000W or 4000W with an optional 3 Channel convertor to spread the load over many channels. With a 7 inch LCD display, simply program 24hr cycles to suit. Includes an IP44 weather rating, built-in digital CPU (smart control performance), memory function, and 3 year warranty.