i would say on a 40 gallon breeder many acros could easily grow and flourish with two bulbs. there are 288 leds I will set up a few tanks with this. I would say they will out last and out perform t 5s, pc's, and the ho leds i am now using smoke halides completely. so far, in all the tanks i have switched, i aM REAL pleased with led performance. this is simply a light that will out perform t5, pc and vho pound for pound every time.
i just got 6 300 watt leds delivered and they seem way brighter than a brand new 1000 watt bulb