Because corals undergo photosynthesis during the development of their exoskeleton, it's important that they get exposure to sunlight. Under the sea, they can get the supply of light they need because nature provides it for them. However, in an artificial environment such as an aquarium, you, the owner, should be the one to provide that light.
If you're looking for a good lamp to use for your aquariums, try out the Coralive Compact 10000K Fluorescent Light Bulb from Pet Store
. This lamp simulates the sunlight coming from a tropical sun at high noon, so you can just imagine the intensity and brightness the light it produces. Thus, it is classified as a super daylight bulb that can be used for fish that naturally live in the tropics.
The light from the Coralive Compact 10000K Fluorescent Light Bulb is sparkling white with hints of blue rays. It contains phosphors that naturally enhances colors, making your corals (and your fish, too) look more vibrant and alive while providing them with the sunlight they need.
At 21 inches long, this lamp is ideal for smaller fish tanks
. It runs at 55 watts, so it uses a small amount of energy even with the intensity of the light it produces. You don't have to worry about your electric bills suddenly going through the roof with this lamp.
Coralife Fluorescent Lamp, 10,000K 55 watts 21in, European pin base