The Power-Glo Fluorescent Aquarium Bulb is a linear fluorescent bulb with a color temperature of 18000 Kelvin and fits all suitable standard and electronic ballasts, Color temperature for fluorescent lights is assigned a value based on a human color perception that matches the color of the particular lamp, This Power-Glo Fluorescent Aquarium Bulb generates super bright light with a strong blue spectral component supporting the photosynthetic corals, invertebrates and other marine life, The Power-Glo Fluorescent Aquarium Bulb is great for simulating open water lighting conditions as well as providing a beneficial spectrum for a variety of freshwater and marine aquariums, Glo T8 bulbs feature quality components and raw materials that contribute to a long lasting performance, Linear fluorescent T8 lighting technology offers excellent energy efficiency, The Power-Glo Fluorescent Aquarium Bulb Features and Benefits:, - T8 25 mm diameter bulb fits standard and electric ballasts, - Energy efficient, - Close placement to water surface offers the potential to maximize light entry into the aquarium, - High CRI values for accurate viewing of aquarium, - Low heat production, - Intensifies fish and coral colors, - Generates very bright light, - Adds a vibrant blue and white illumination, - Perfect for all standard and electrical ballasts, - Ideal for marine and African cichlid aquariums, 48"" length SKU: RCHG0497