In a previous thread I read, I member talked about how his zoas grew really fast from only 4 hours of light. In this thread I will confirm this information with my own testing. I will make a tank that has 2 compartments so that the water quality is the same. I will have 2 of the same lights, one running 10 hours a day and run 5 hours on and 7 hours off for the other. I will make sure no light from one side leaks over to the other when one light is off. I will keep updating this post and I will post pictures of the tank in a couple days when im done my Finals for school. If someone else would like to test, lets be in contact so we can have a more conlusive test. Not sure if this is the right thread and I will do zoas and one more coral. you guys choose.