Crop Master Sun System 10 -- 400w Switchable Ballast High quality ballast will insure years of trouble-free use. Extruded aluminum ballast enclosure dissipates heat for maximum reliability. The powder coated finish is attractive and durable. High temperature capacitor insures long lasting durability. Our exclusive Power Pointer® easily switches from 120 to 240 volt power! Simply unplug the detachable 120 volt power cord (included), turn the Power Pointer® arrow down for 240 volt power and plug in a 240 volt power cord. THAT'S IT! (240 volt power cord sold separately, #903082). A barrier wall between the ballast and the capacitor/ignitor helps keep the critical components cool. Lamp cord receptacle – accepts all Sun System® lamp cords (sold separately). Heavy duty handle for easy carrying. Rubber feet reduce noise and vibration. ETL Listed. Ultra Sun HPS -- 400 Watt: The Ultra Sunâ„¢ High Pressure Sodium (HPS) lamps have a Kelvin temperature rating of 2000°K which is ideal for the fruiting and flowing stages of plants. It is also an excellent lamp for full term plant growth. These lamps have been specifically engineered for horticulture applications. Ultra Sunâ„¢ lamps are high quality, feature robust construction and have excellent reliability at an economical price. 50,000 Lumens Glass Size: T-15 6" AC Reflector This value reflector offers excellent performance at a cost effective price. Solidly built, compatible with all Hydrofarm ballasts, and priced to fit any budget. Bright & broad light delivery Super air coolable Built in 6" flanges Low profile design Highly reflective specular aluminum Built in socket & cord set Completely sealed removable lens system for easy bulb exchange CSA certified Reflector Size: 8"H X 21"W x 23-3/4"L Accepts: Sodium 250,400,430,600,750,1000 - Halide 250,400,1000