Whole grow w/260W LED, will I need another light?

Hey all,
Just starting my first grow. I have a Viparspectra tc600 in a 3x3x6 tent. I currently have 5 plants started from seed: 2 Chemdawg & 3 OG Kush. I figured the tc600 would be ample to start the plants & get them through veg. Not sure if it’ll be enough light for flower. Should I get another light & run 2 lights during flower or purchase a unit that can produce enough light to flower a 3x3 on it’s own. Thoughts?

You can get a cheap soil tester with light meter to get approximate measure of light flux at different spots on canopy in your grow.

On my meter I look for 1000+ in veg and 2000 for flower.

It's a little shy of the 30 watts per foot but not by much. Maybe you could add a couple of real low wattage bulbs to bump it up over 30 watts.