Its unlikely you will find a conversion kit to run a HPS from a MH ballast. Loads of stuff on here about switchable ballasts etc but the basics are that HPS systems need a starter that the MH doesn't so you can get MH bulbs to work in HPS ballasts but a MH ballast does not have the required starter to fire up HPS bulbs.
JackHerer Reviewed by JackHerer on . Flowering with MH Will work? Will be dumb? Will be no potent? Rating: 5