I dont think it has batteries. Just a removable power wire. I am going to try moon lights later. Put 1% while light at 10PM and 1% at 1 PM. See if 1% is reasonably low. Right now..gonna let the fish try to get back to normal schedule after last night's ooopsThe program is only as good as the programmer. So, i have no idea how to code any of this anyhow. I would probably need a dedicated moon light bar. But, usually asleep anyhow. The fish are a bit upset with me while I am toying with light power settings.
Also, I am not sure why the controller needs plugged in and not battery operated. I can only guess it is because, since the lights are run by the controller settings, it needs to be on? And batteries die?