I also believe alot of ppl have luck with the black box because of the lower wattAge leds(earlier models) and set its a set it and forget it type of fixture..... Well the non dimmable ones...

With higher end units, its alot of guess work and ppl tend to blast their corals with too much light....

I almost gave up on my vegas, when things started going south.... But i figured out it had to do more with my husbandry than the lights.. Although i was blasting my tank with too much light.....

So glad i didnt as stuff has turned around rather quickly... And growth is finally noticeable..