These lightweight durable compact strips utilize ultra blue LEDs spaced at intervals of 2 inches to ensure complete coverage resulting in a beautiful shimmering moonlight effect(Our 48” model has an incredible 24 LEDs). 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.