Less electricity, less heat, no need for chillers - what's not to love? Welcome to the new age of aquarium lighting! LED or Light Emitting Diode lights are taking the market by storm, and it's easy to see why. LED lighting is the most cost effective form of lighting for your aquarium today. When compared to traditional fluorescent or halogen lighting, LED lights require significantly less power to operate. LED lights can convert a small amount of energy into a high light output capable of illuminating your entire tank with a uniform wide distribution of light.