Just get a MH Blue and you'll have a better bulb no need to switch ballast/hood and all that. Eye Hortilux is the MH Blue I'd recommend, damn bulb is expensive. Flower with HPS then last 20 days finish with MH Blue.
If I take time to answer a question regarding your post, OP; I demand a rating + or - your choice. I take time to answer with spell check and proof reading. If my post was helpful or not, say so please.
Female gardener. Currently growing Weed.
I really miss the negative rating! Yeah I would bust a fool up back in the day; negative rep!