Petssupplies-Fish & Aquatic Pets Actinic lamps emulate the softer shades of blue light found at dawn, dusk, and in deeper water. With a spectral peak at 420 nanometers, actinic lamps promote photosynthesis and cause corals to fluoresce in beautiful glowing colors. For use with saltwater and coral reef aquariums., Brand ZillaReflects color pigments in organismsEnergy-efficientPeaks at 420 nanometersSpectrum resembles that of the absorption peak of chlorophyll-a
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