The Aqua One Sunlight/Tropical Light Bulbs are a combination of two light spectrums, sunlight and tropical light. With their refreshing natural light, the sunlight lamps are designed to give the illusion of natural sunlight. Not only do they brighten the inside of your aquarium, making the colour of your fish a lot more vibrant, they also provide an adequate amount of light for terrariums plants to thrive off. The tropical lamps are designed to parallel the optimum wavelengths required for photosynthesis to produce and stimulate growth in aquatic and terrestrial plants. Additionally, tropical lamps intensify the natural beauty of tropical fish and goldfish.