How much light I need for coral in my 50 gal tank?

I have a 50 gal tank, live rock and live sand now, gonna have about 5 fishes. would like to add some corals. how much light do i need. what is the cheapest way to get a light fixture for my tank? where can I get them at? please help
Answers:
Actually, the that answer is only mostly right. The amount of light you need depends on what you are keeping and the spectrum you decide to go with depends on what you are trying to achieve. The bluer the spectrum the more color but less growth. The yellower the spectrum the more growth; but less color. Most people stay sort of in the middle with either 10 or 12K bulbs. As for actinics, that is not a must but if you run a 10K bulb which is on the yellow side of blue, the supplementing them with blue actinics provides a full spectrum and you get great color as well as good growth. SPS require a lot of light for the most part while mushrooms and some other softies you can get away with less light. IF you want to do softies and some LPS like Frogspawn you can get away with some nice Power Compacts. If you want SPS corals then you should either go with a good T5 setup or MH.

http://www.wetwebmedia.com

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the minimum lighting u need is 3 - 5 watt%26#92;gal
u must use 50% Actinic Blue Fluorescent Bulb (420nm peak) = 100% blue spectrum. These are the most widely used aquarium

and the other 50% (10000K - 20000K) High performance upgrade which are great for corals, live rock, and related marine life.

go to
http://www.marinedepot.com/homepage.asp...