Aquarium light timers are programmed to turn on and shut off aquarium lights at set intervals. They control the amount of light to imitate the day/night cycles in natural habitats. They also prevent algae growth and maintain photosynthesis cycles in aquatic plants. They are synchronized to a built-in clock or oscillator. They are usually installed outside the tank between the light bulb and the power source.
Power: Choose an aquarium light timer that runs on both AC and battery power, and can be set to switch between power sources. Look for one with status lights indicating battery power to alert you when you need to replace the batteries.
Plug type: Choose an aquarium light timer with a three-pronged socket to guard against power surges and high voltages. This can also block or reduce surges before they reach the light bulbs.
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