I don't have a lot of basis for comparison, but I think the COB fixture I built is creating a "bigly" good environment for the plants.
Whose light do you have for veg? Is it 600w at the wall or just rated as a 600w hid replacement?
If you give us your tent specs I can suggest what you might consider for a flower light. As a rule of thumb with hps for flower, I would need at least a 1000w hps for this tent with the attendant heat issues. This fixture with 16 50w COBS pulls 800w at the wall with 56% efficiency and generates very little heat relative to the hps bulbs. With nothing but the filtered exhaust fan the tent stays between 75-80F during the "day".
Here's a shot of my fixture in a 5x5 flower tent
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And some more recent shots week 3 of flower
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