Spectralux High Pressure Sodium Single-Ended Lamps feature high lumen output and 2000° K color temperature, making them ideal for horticultural applications. Fruiting and flowering plants will thrive under these lamps! They 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.