Aquatic Freshwater Plant LED Lighting Aquarium Chihiros Water Fish With Tank. Channel 1,3 for lighting intensity 2. Channel 2,4 for opitical uniformity. Improve your tank performance to new level. What is the Smart controller? Slow acclimation, vivid color, fast growth. Sunrise, sunset, lunar cycle, four seasons, cloudy, storm, moon. 4 channels programmable and dimmable. 8