I personally prefer quantum board style lighting. It allows you to have more grow height and the light is spread out more evenly. With that said, though, it is less intense overall vs cobs as it is spread out more. I made my light using the same diodes as quantum boards and can have my lights as close as 12" from my plants. If COBs are put close to plants it is very easy to burn/bleach them compared to quantum boards. The light I would personally go with for that tent size would be: https://growerslights.com/products/horticulture-lighting-group-260-watt-xw-quantum-board-led-kit?variant=8194589425765 or look up meijiu on Alibaba for some cheap yet still good quality quantum board style lighting.