Full Spectrum HPS Question

I went to my local store and bought all my equipment, growtent, cool tube, ballast, ducts, fans and the guy at the store talked me into a full spectrum 600w HPS. I was going to do MH and HPS. So is this ok to use for the entirety of the grow? Instead of swtiching from MH during vegging to HPS during flowering.

You can use it for the entire grow.