I was designing the LED light of 200 W with LED combination of 9 series / 8 parallel, each LED is 6V thus total output voltage is 56V. I am using Meanwell xlg 200 W driver. But this resulted in high temp rise and blinking of LED after some time. Does making an LED combination of 8 series / 9 parallel solve the problem without affecting light output?
LEDs are sensitive to temperature rise and will fail quickly if allowed to operate outside their design limits. A high power system like you’re building requires cooling to keep that temperature in range. You will need a heatsink and likely forced-air cooling to make that setup work.