150 W HPS Ballast question

[bloodbrother]

OK so I found this old ballast I bought about two years ago but can't seem to find the capacitor... but then I thought I read somewhere that not all HPS have a capacitor? or maybe it was not all MH had one... can't remember. Just wondering if anyone can shed some light on this for me.

It is a 150 W Sylvania Transformer LU150/120R says to use lamp types 150W HPS S55..

On the wiring diagram on the transformer it says "optional cap" then underneath "for HPF only"

bloodbrother Reviewed by bloodbrother on 07-23-2008. 150 W HPS Ballast question OK so I found this old ballast I bought about two years ago but can't seem to find the capacitor... but then I thought I read somewhere that not all HPS have a capacitor? or maybe it was not all MH had one... can't remember. Just wondering if anyone can shed some light on this for me. It is a 150 W Sylvania Transformer LU150/120R says to use lamp types 150W HPS S55.. On the wiring diagram on the transformer it says "optional cap" then underneath "for HPF only" Rating: 5

[bloodbrother]

oh and there are only 4 wires coming out of the transformer