I just installed three new Neptune Sky lights on my 240 gal reef tank. WOW! I was looking for a system that will give me the day light and moon light at night. With the Sky lights, I can select a nice blue light on my reef or select a great light for photoshoot of the reef or other light setup for SPS grow. All us already done by Neptune. At the end of the day, the lights will slowly diminish intensity and replace gradually by the moon light. I like to see what reef hobbyists are using to light their SPS or LPS