LEDs are the future of aquarium lighting and the Marineland LED Aquarium Light is the perfect way to upgrade an existing aquarium with this advanced lighting technology. Long lasting 60 mW LE-never replace a light bulb again Energy efficient, low voltage power supply helps reduce energy costs. Day light LEDs create a shimmering light that mimics the natural underwater effect of sunlight. Three position switch-on, blue, off night light LEDs allow for night time enjoyment of the aquarium. No mercury in LEDs, making them better for the environment than traditional aquarium lighting.