A general office that is $250\text{'}$ X $150\text{'}$ will be used for regular office work. The ceiling height is $10\text{'}$ and all working surfaces will be $3\text{'}$ from the floor. If the luminaries will be ceiling mounted, all ceilings and walls painted white, and all luminaries cleaned every six months, what lighting should be specified? Use fluorescent lamps in prismatic lens fixtures