Light size question

[greenesgreen]

My 75 gal tank measures 48" in length. Do i need to get a 48" light setup to provide the proper lighting or could i go with a 36". I'm just trying to explore my options. Excuse my negligence on the subject, i'm just getting started. Thanks

 

[drtrash]

36 inch will work ans long as the lights are agood quality. The shorter fixture is more appealing IMO.