Definitely. You definitely won't make it to flower 7 plants on what you have so far. Think 5-7,000 lumens per sqaure foot. An HPS does put out a red spectrum which is ideal for flowering but that doesn't mean its useless in veg.

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Herb the gift, from the Earth, and what's from the earth is of the greatest worth. So before u knock it, try it first, you'll see it's a blessing and it's not a curse. - Ben Harper