In a large tent, more lights can provide more coverage footprint. I'm not sure you could cover 8 plants with one light. You can do two bigger lights as long as they can each flower a 4x4 footprint. I've seen good results on this forum with the Platinum lights. I use a California Light Works Solar Storm 440 and it's a powerful light and it gives me great results, but it's rated for 3x3 and they are expensive. You could use two of their CLW SS880s and cover that space but two of those is probably close to 3k. Kind Led are another high end LED but again they're expensive. Like DAAAS69 said, check out the 315 LEC, the results on this forum are amazing. You'd have to check on the coverage to figure out if two is enough. Good Luck!