http://www.ebay.com/itm/Dimmable-165...item5658ce27ed
That is the unit I have on my 54 corner, took the optics off for 120 dispersion.........provides full coverage front to rear side to side.
In case you don't know, here is a link to the "corner club" thread -
http://www.reefcentral.com/forums/sh....php?t=1698273
Steve