Plantmax High Pressure Sodium conversion grow lights bring the convenience to you. HPS conversion technology gives you the advantage to resume initial vegetative stage to later flowering stage. You can use the same metal halide fixture with high pressure sodium conversion lamps and still achieve the ultimate yields all year round! This Plantmax PX-LU940MH High Pressure Sodium conversion lamp operates at 940 watts with a long life of 24,000 hours. Use with a metal halide ballast only.