400w Aqualine Buschke 5000K German screw type metal halide bulb. The Aqualine 5000K is a metal halide lamp with a colour temperature of 5000° Kelvin - daylight.This lamp was specially developed for the illumination of freshwater aquaria having a high percentage of red light and a high intensity - 11000 lumens per watt. It gives planted aquaria a natural appearance and enhances plant growth.