I think your question is about light?

HPS do not use the same ballets as a MH light. Are you switching your transformer or is it one of the new switchable ones?

If you are ready to flower you need to switch to the HPS light. MH does not have the proper spectrum to flower. However they do make a few Mh bulbs that are enhanced spectrum for flowering in a MH transformer.
Zandor Reviewed by Zandor on . hps{high bay lighting]or mh grow light for budding 1st time went /12/12 4 weeks ago had problem with nurt. put mh grow back in and they look better added air stones right mix know,clean water right ph {per u guys/thanks} in for 3 days waiting now should i put hps back in{got it from work, not a GROW light,} Rating: 5