Plant growth Tubular High Pressure Sodium HPS without ignitor lamps are availabe in 400, 600 Watt and 750 Watt. Brand references to these are Osram NAV T Plantastar, GE Lucalox T PSL or Photo Synthesis Light, Sylvania SHP TS Grolux and BLV Growmaster NAH. These types are designed for use in Hydroponics, horticulture and plant growth applications.