Aquarium lighting has big part to play in the look of your aquarium and also the health of your fish and plants. The most important factor to consider when buying an aquarium lighting system or an aquarium system with the lighting already installed is what type of fish and plants you are looking to keep in your aquarium.
If you are planning to keep plants in your aquarium then choose carefully as it will make the world of difference.
The other factor for fish tank lighting is that you are trying to create a natural environment for the fish; this includes having a similar lighting cycle to the day, with lighting during the day while the sun is up and dark for a period of time at night.
The best thing you can do is to get a timer...