The Ultra Sun is a 6500K high intensity trichromatic full spectrum daylight lamp. With a CRI rating of 98, it provides excellent color reduction for optimum viewing of your freshwater or marine fish and live corals with a balanced full spectrum of visible light and UVA. Promotes photosynthetic processes in plants and marine algae. Ideal for all freshwater and marine fish as well as reef tanks. Zoo Med's line of fluorescent aquarium lamps are made in Europe for ultra high quality, color, and longer burn life. Our energy saving T8 sizes can save you up to $30.00 per year in electricity over the thicker T12 size lamps! Effective up to 10,000 hours.