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OPAAL (One-Piece Automatic Aquarium Lamp) is a combination of lamp and controller in one housing. OPAAL means easy installation of aquarium lighting, simplified control and, above all, fewer wires. You can treat the lamp I have built as a recipe or inspiration to create your own version. Below you will find a list of elements and a diagram of their connections. The heart of the lamp is the Arduino program that makes the lamp works like magic.;)