Looking good mate!
In regards to the light sitcho, I wouldn't return the unit if the balls already rolling, that would disrupt your grow to much even though the plants still very young. I did a coneversion /build mid grow and it was a nightmare haha.
But this light looks prime for a conversion!at a glance Its already made for cobs internally I'm guessing. Maybe buy a set of good efficient cobs, gather all the other misc material, do a bunch of research and space prep then convert that unit. You would have a bad ass light for roughly $100/on top if what you've already paid. Could have it done in a day if you're a handy person.
Hope my two cents helps bro, cheers for the tag. I'll follow along for sure!
Peace