Zoo Med's Ocean Sun is a 10,000K High Intensity T5 High Output fluorescent bulb with strong emissions in the blue spectrum-stimulating deeper ocean environments. Ideal for marine aquariums, reef aquariums and fresh water aquariums where a deep water effect is desired. High output T5 bulbs provides higher lumen output compared to ordinary T8s and T12s, distributes the light evenly across the water surface and generates less heat as compared to metal halide lamps. Combine with Zoo Med's Coral Sun to promote the growth of zooxanthellae algae, essential for the growth and well-being of all live corals and invertebrates. Use with Zoo Med's AquaSun T5 HO Aquarium Hoods. Note: T5 HO lamps can only be used in hoods designed for T5 HO Lamps. This high quality lamp is manufactured in Germany. Overall lamp length is 22"; 24W. Shipping weight: 1 1/4 lbs.