If you need a lightweight and durable blue LED lighting unit then the newer R2 signature series moonlights are perfect for you. “They utilize ultra blue LEDs spaced at intervals of 2 inches to ensure complete coverage resulting in a beautiful shimmering moonlight effect. These compacts are designed to be installed in the same manner as regular aquarium lights, above the acrylic or glass cover. The compact size allows for the R2 Signature Series lights to easily sit beside conventional daylight lighting systems.” These work great with the R2 controller for true more simulation. These come in sizes of 24″, 36″ and 48″ (with the 48″ version being the newest) and retail between $19-70. If you haven’t looked into these yet now is the time to do so to get your fish and corals in the mood.