If you can afford one, buy a HPS conversion bulb. They cost more then a regular one, but will do the same thing as a regular on your MH ballast.

Heres a link to one:

https://www.discount-hydro.com/produ...d=264&navid=28

You'll get far more if you do this because the plant uses the red light to make flowers. The large amount of blue from the MH will work, but not as well as a red light would.:thumbsup: