The experimental research started with the survey of general case of classrooms and set up a model to
inspire the hypotheses of the new classroom model. Five different types of windows were installed for 12 studied
cases to find out the most suitable window type that not only alleviates glare, but also increases illumination
level in classrooms. From the 12 cases, it was found that the window type 4 of the case study number 8 is the
most suitable case because the tilting of the window can best reduce the brightness contrast between outside and
inside the classrooms that soothes glare and reduces the contrast brightness ratio of the window and its
surrounding wall. Inclining the ceiling height down to the window head produces the contrast grading of the
illumination level and enhances the Effective Daylight. When addressing clerestory in classroom, it helps
provide the sufficient illumination level without the need of artificial light during daytime.