The Aqualine 10000 lamp has a color temperature of 13000º Kelvin and a high percentage of the light output is at the blue end of the spectrum. aqualine 10000 was the first metal halide lamp to simulate the light conditions of a coral reef and the new lamp with its improved long term color stability, results is an even more realistic looking aquarium. The corals show their natural colors, and the lighting encourages excellent growth. The Aqualine 10000 helps to transform your aquarium into a perfect reef tank. HQI double ended lamp.