Features: 2 MODES OF WHITE BLUE LIGHT: Provide 2 modes of white light and blue light. BLUE LIGHT PROMOTE CORAL GROWTH: Blue light helps to create Vitamin D3 which promotes calcium absorption for coral. WHITE LIGHT PROMOTE STERIILIZATION AND PHOTOSYNTHESIS: White light helps green plant to make photosynthesis which creates Oxygen for fish. MAKE FISH AND PLANT COLOR MORE GORGEOUS: Blue light shows the fluorescence color of fish at night, which can increase the fish appreciation value. EXTENDABLE: The aquarium lamp can be extended to fit for different tank size.