I'm far from an electrician... but I do know there's three separate salt packages in the bulbs which require a staggered fire up, so as far as I know you need a 315 ballast to get them fired properly.
Mile High Colorado
One of the most beautiful places on earth, massive ecological diversity across the state. Last week on a drive to our dispensary in Crested Butte I started at 85 degrees in Pueblo and drove through two snowstorms and drove through gorgeous sunlight canyons on the way.
Mile High Colorado
Whoever told you that is making shit up. There's no way they'll shut down or hurt the med grows and shops. That's the oldest, most respected part of the industry.
Mile High Colorado
Light distance doesn't affect quality of the lower buds, they're just as dense as the tops, granted, they are smaller. And those buds are 8+ feet from the lights...
One HUGE cost factor you're missing is bulb replacement. You'll change 600s 3 times before I change mine once.
And we're getting...
Horti Blues which I loved have a similar spectrum to the 4200K 315s.... the horti blue 600s even say on the box that they're good for 6-8 months...
Mile High Colorado