i would go with several smaller leds. better coverage, more wattage. 4 pro grow 180's will cover a 5x5 at just half a foot away from canopy, they each pull 160watts that will total 640 watts. that will out perform a 600 hid probably even a 1000 hid. that will run around $1100 for all 4. or around 300 each. but the more you buy the more they discount.
for led thats the best deal for the money. better leds cost 3 times as much. but perform close to the same
also lumens are irrelavent. lumens by definition is visible light to the human eye. plants dont absorb that spectrum of light. they absorb high blues and reds and low greens and yellows