CMH lamps have a very broad light spectrum which is more similar to the sun itself than any other form of HID lamp. Nanolux has taken CMH technology and increased its operational efficiency, making the most comprehensive spectrum of light output for an HID fixture even better. The CMH lamps also have increased efficiency in PAR/Watt compared to other forms of HID lighting. The CMH fixture can be used as a primary veg light or a supplemental full spectrum light. Fully sealed ballast is top mounted CMH 315 Single Lamp Fixture vertical mounting position provides an even-light footprint 97% GERMAN REFLECTIVE MATERIAL Meets ETL Standards Both Nanolux CMH fixtures can be used with any 315W 3K or 4K horticultural CMH lamps from all leading quality brands Specifications Power Factor: greater than equal to 0.99 THD: greater than equal to 10% CF: less than 1.7 Input Frequency: 50-60Hz Voltage: 120/240V Lamp Base: PGZX18. No Lamp Included.