I know it's probably been asked before but I couldn't find the thread, I am thinking of getting two value fixtures for my 75 gallon reef. I like the dawn dusk effects before and agrees a light fixture gos on and off. From people who have them do you use the blues only for your dawn and dusk. Also, how's the growth under them, I use t5 and metal halide currently and have great growth! I just want less heat exchange and less power usage, ideally I would like the programmable fixtures but can't afford that at the moment.