Get a HPS.The guy in the store is wrong.Red spec. is what you want for flowering.It's fine for Veg too.Floro's are weak in conparison and your buds will be all fluffy and thin.If your only going to veg and then put outside for flower then get a MH or Floro.
If put outside keep in mind the hieght ,by the time flowerring accures the plant will double or triple in size.