Why not just a dual 48" T8 shop light?? If you just have swords that would be plenty of light.
Or another option is this which is what I have for a 55 gallon but its a different brand. http://www.thatpetplace.com/48in-quantum-deluxe-strip-light-2-40w
Or another option is this which is what I have for a 55 gallon but its a different brand. http://www.thatpetplace.com/48in-quantum-deluxe-strip-light-2-40w