I just set a 125 and i am using the light from my 55. It is a 48" 4 bulb T5 light and it is working fine. Its FOWLR for me so it really depends on what you plan on keeping. Picks......
This one was taken right after the water was added. Still very cloudly..
This one was taken after it was all cleared up.
This is just a cool shot but it shows how the light is distributed pretty well...
In my opinion if you dont plan on keeping corals and such then there is no reason to spend a fortune on lighting. IMO though
Also right now there is no hood on my tank. The light pretty much lights up my whole living room & dining room. Once I build the hood it should keep much more light in the tank were it belongs.