<![CDATA[Abstract- Light shelf is one of the daylighting strategies used in Sinar Mas Land Plaza Tangerang. However,based on observations made on the object of research, light shelf design on Sinar Mas Land Plaza Tangerang isnot optimal. This is because the purpose of a light shelf that should reflect sunlight directly to enter much deeperinto the room does not occur. This is evident in the use of artificial lighting in areas close to openings, so it isnecessary to evaluate the light shelf design to improve light shelf performance, which is also useful for improvingthe Green Mark BCA assessment.This research uses experimental research method to see daylight penetration by simulating model usingEcotect which can simulate model by ray simulation. Evaluation is done by manipulating variables from lightshelf design such as ceiling design aspect, light shelf shape, and light shelf slope to see effective light shelf designto be applied to Sinar Mas Land Plaza Tangerang. Based on the research, it can be concluded that theperformance of the existing light shelf design is not optimal because of the fins that are above the light shelf toblock out direct sunlight. The sloped ceiling design also affects the daylight penetration distance into space. Lightshelf design that effective at North orientation is a light shelf design with curved shapes, while the light shelfdesign that effective at South orientation is a light shelf design with a slope of 200. Improving the light shelfdesigncan increase the Green Mark rating up to 8 points.Key Words: light shelf, daylight penetration, assessment of Green Mark, Ecotect]]>
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