that dual spec HPS you got ain't a bad thing by the way, fancy for sure to have, but is isn't the optima way to go really, you know. it can be too hot for the young seedlings, it ain't really in the spec for veg nor is it in the spec for flower too well either.
vegging can be done just great with a few CFLs in cool white spec, no heat issues and if you not veg till they get giants they will just do fine. for flower the simplest HPS do just fine and the go for half the price as a dual spec does. that doesn't implies that you have to kick it out really but if it is used up you won't have to get the same again, rather go for a bit cheaper normal one