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"Moon lights" are typically low-voltage lights (often LEDs) that are designed to replicate the light of the moon, and are usually on a separate power source/switch from the main tank lights. They offer just enough light to barely see the tank inhabitants by, without being bright enough to cause algae problems or disrupt the fish's day/night cycle.How do you turn your grow lights off while just leaving on a moon light,if you only have a single fixture that takes two tubes.My fixture has a 6700k tube and a 10000 k tube for max plant growth.What exactly is a moon light bulb? is it an actinic tube?How do i turn one off without the other?