Great for Live Planted Aquariums. The 6,700K lamp provides plants with the light energy for photosynthetic reactions necessary to stimulate lush growth in freshwater aquariums. Replicates sunlight and generate a full-spectrum, high-intensity output in the appropriate wavelenths to promote photosynthesis. Compact fluorescent lamps emits powerful lumen output without consuming high energy or producing excessive heat. They provide photo-biological light requirements for aquatic life and enhance the appearance of the aquarium. The lamps come in two styles European straight pin base arrangement and japanese square pine base arrangement.