The Plantmax PX-MH600/LU/7200 Metal Halide Conversion grow lamp brings the convenience to you. MH conversion technology gives the advantage to continue the initial vegetative stages after the flowering stage. You can use the same high pressure sodium fixture with metal halide conversion lamps. This conversion grow lamp operates at 600 watts with a long life of 10,000 life hours. Use with high pressure sodium ballasts only.