A strong, vibrant light is essential to the growth and health of your aquarium. This much you probably already know. But did you know that the average fluorescent tube loses about 50% of it's lighting output quality within one year? This results in a distorted spectrum, inefficient plant and coral growth, and less intense fish colors. LIFE-GLO 2 High-noon spectrum for aquariums, terrariums & vivariums POWER-GLO Promotes coral, invertebrate and plant growth AQUA-GLO Intensifies fish colors and promotes plant growth FLORA-GLO Optimizes plant growth MARINE-GLO Promotes marine reef life SUN-GLO General purpose aquarium lighting Hagen offers a wide variety of tubes for every aquarium setup. They also provide you with a reminder sticker to place either directly on the tube or on the aquarium itself to remind you when it's time to replace the bulb. Or, if you prefer, CLICK HERE to sign up, and we'll send you a reminder when it's time. So, replace your tubes regularly. You'll love the results and your fish will love their home. Check out our GLO Lighting Guide online or download the complete guide PDF (1M)