Many of us spend many time in office, working a lot and under a lot of pressure. The lighting in office should focus on increasing working productivity and decreasing working pressure for employees. Natural light helps maintain good health and can cure some medical ailments. The pleasant environment created by natural light decreases stress levels for office workers. Productivity increases with the improved health of workers, and with better productivity comes financial benefits for employer (L. Edwards and P. Torcellini, 2002).