Deciding on what to go for a grow space of 4Wx6L

I would run two lights. I run two lights even in a square tent. I have better control of light distribution. And, if one light dies you can crank up the power on the other to get by until you fix/replace the bad light.

Your best option would be to add a second light that will fill the space up. Really depends on your budget and how much you’re willing to fork over to make it happen. You definitely have options. I’ll tell anyone to go and get an HLG Scorpion Diablo. It’s perfect for a 5x5 space but also costs 2 grand in Canadian dollars. So not many people want to spend that kind if money on a light. But definitely doubling up on the Mars Hydro would fill the 4x6 space better. Hope that helps. 🤙