I have 20 gallon long saltwater tank and i was using normal light bulb and i did upgrade lately to this people in pet store said that this light is good for growing corals i really don't know anything about it just i know it 55 wat it's better because my old bulb was 15 wat anyway this light comes with blue and white bulb maybe its t5 light i don't know anyway i hope i will get some replies 
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and this is the bulbs
And this is information about the light in the link below
http://advance-reef.com/home/index.php?option=com_content&task=view&id=639&Itemid=138
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and this is the bulbs
And this is information about the light in the link below
http://advance-reef.com/home/index.php?option=com_content&task=view&id=639&Itemid=138
