Spectralux® High Pressure Sodium 1000 Watt Single Ended Lamp features high lumen output and 2000° Kelvin color temperature making them ideal for horticultural applications. Fruiting and flowering plants will thrive under these lamps! It can also be used as a full term light source. They are engineered to be compatible with both magnetic and electronic ballasts. Spectralux® lamps are optimized for use with Sun System® brand ballasts and reflectors.