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:
Vancefish Reviewed by Vancefish on . Flowering question My plants are 22 inches tall, and I have 48 inches of open space from the top of the plant to the bottom of the light. Should I start flowering now considering th space limitations I have? Strain is WW from Nirvana. Sure is looking awfully full in my 2 x 4 closet. Rating: 5