The Aqua-Glo Fluorescent Aquarium Light Bulb is a linear fluorescent bulb with a color temperature of 18000 Kelvin and it 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 Aqua-Glo Fluorescent Aquarium Light Bulb generates an ideal fish color enhancing spectrum while also delivering a strong photosynthetic range to stimulate vigorous plant growth, 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, and works well in combination with Power-Glo or Life-Glo aquariums, The Aqua-Glo Fluorescent Aquarium Light Bulb Features and Benefits:, - T8 25 mm diameter bulb fits standard and electric ballasts, - Ideal spectral peaks for enhancing fish color, - Promotes plant growth, - Perfect for all standard and electrical 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, 36"" length SKU: RCHG0476