The ATI 54W 48" Coral Plus T5 HO Lamp combines the properties of a Blue Plus (~50%), Aquablue Special (~40%) and Purple Plus (~10%) producing a bulb with a cool, crisp white color with hints of red and blue. The higher blue component compared to an Aquablue Special produces better fluorescence in capable corals and the red component is excellent for color rendition. Approximate color temperature of 15000K+. 45.75 inches from end of pin to end of pin. For 48" T5 high output lighting fixtures. Made in Germany.