AquaticLife 16.5 Inch 460/620nm Purple 18 Watt T5 Fluorescent Lamp 16.5 inches from end of pin to end of pin. AquaticLife Part Number 410222. Ideal for: Acroporas (SPS), Anemones, Clams, Hard Corals (LPS), Leathers, Mushrooms, Polyps, Soft Corals, Xenia. Phosphor mix produces a light spectrum that accents red pigments in corals.