The Life-Glo linear fluorescent light bulb is T8 normal output bulb with a color temperature of 6700K, Color temperature for fluorescent lights is assigned a value based on a human color perception that matches the color of the particular lamp, It fits all suitable standard and electronic ballasts, This fluorescent bulb features a premium tri-phosphor formulation with a high CRI value for both accurate aquarium viewing and superb photosynthetic support of plants and corals, It is a great way to illuminate your aquarium, The Life-Glo Fluorescent Aquarium Bulb Features and Benefits:, - T8 bulb fits standard and electric ballasts, - Energy efficient, - Close placement to water surface offers the potential to maximize light entry into the aquarium, - Photosynthetic support of plants and corals, - Ideal for optimal plant growth, 24"" length, 1"" diameter SKU: RCHG0499