The Zoo Med high intensity actinic lamp produces strong emissions in the short wavelength region of the spectrum, peaking at 420 nm. Ideal for marine aquariums, reef tanks, and African cichlids. Promotes the growth of zooxanthellae algae, essential for the growth and well being of all photosynthetic corals and invertebrates. Simulates the short wavelength blue light which penetrates to reef depths in nature. Output closely matches the absorption peak of blue chlorophyll used in photosynthesis. Long lasting: Effective for up to 10,000 hours.