We like to have lights for our aquarium. Some of us use light for plants in aquarium But of course lights with fancy colour is pretty cool too.
The type of light you need for your tank really depends on what you plan on keeping in the tank.
To make life easier lets see several types of light appliable to an aquarium
basically there are four type of lightning

•  fluorescent lightning
• incandescent lightning
• metal halide lightning
• LED (Light Emitting Diodes)