well that wouldnt be enough for a 5foot tank
plus i wouldnt buy those types of fixtures if I were you.
you can build your own which is what im doing and im doing a group buy right now
Group buy:
http://www.canreef.com/vbulletin/showthread.php?t=70376
Build Thread with parts:
http://www.canreef.com/vbulletin/showthread.php?t=70413
4 a 5 foot 125g which probably is around 22 tall 22 wide
if you look at the some of the 3w cree leds in that group buy and you are looking for a 14kish colors
you would need about 72 royal blue and 48 cool white with 40degree optics at about 11inches from water
and you can tune from there adjusting the amps to get the right color and brightness as long as you have them on dimmable drivers for each color
if you want an LED fixture I would go with either the vertex like monocus has or
http://www.aquaillumination.com/
or hire me to build it!