Oh, and don't be scared to set your HPS light up now, I know you've heard how "HPS is good for flowering" and "MH is good for veg". I'll let you in on a little secret, HPS is works just fine for veg. I'm speaking from experience. Light intensity is more important than light spectrum. Plus, that HPS should take care of that chilly basement

Stop by the thread in my signature, you can see on the first page how fast they grow vegging under the HPS