[outacontrol]

Here is a link to Marineland for common aquarium dimensions: http://www.marineland.com/MLCatalog.aspx?taxid=1911805

Originally Posted by reefwars

better question are how common are 5 ft lights , ive never owned any that were five feet and the majority you see are 48"

Here is a link to concept aquatics, Dave has about 13 different lights in the 5' long variety: http://www.conceptaquatics.ca/index....ture_length=87

Plus there is nothing wrong with lighting a 5' tank with a 4' light. One of nicest tanks I have seen is a 6' tank with a 5' light on it.